*202 OPINION AND ORDER
delivered the Opinion of the Court.
Petitioner Jared Preston, petitions this Court pursuant to Rule 17, M.R.App.P., to issue awrit of supervisory control and vacate the order of the Eighteenth Judicial District Court, Gallatin County, limiting the scope of discovery. We vacate the District Court’s order to the extent that it limits the scope of Preston’s discovery.
We consider the following issue and subissues in this Opinion and Order:
1. Is a writ of supervisory control appropriate in this case?
a. Did the District Court err in denying discovery of evidence of substantially similar injuries caused by the same design defect in other product models manufactured by the Defendant?
b. Did the District Court err in limiting discovery to the time period beginning with the manufacture of the N12 model roofing nailer and ending with the Plaintiff’s injury?
Factual and Procedural History
This request for a writ arises out of a products liability action in which Jared Preston alleges defective design of the N12 model pneumatic roofing nailer manufactured by Respondent Stanley-Bostich. Jared was working as a roofer with his brother and co-worker Jeremy Preston when the injury occurred. Jared was laying out shingles on a roof while Jeremy nailed the shingles in place using the N12 model nailer. Jared was on his knees and had bent over to retrieve a shingle blown out of place by the wind. Jeremy was standing behind Jared with the nailer in his hand. As Jared straightened up, he bumped the tip of the nailer causing it to discharge a nail into his head, causing him injury.
The complaint against Stanley-Bostich alleges design defect and alternative design, and requests punitive damages. Preston’s claims *203 are based upon the fact that, prior to the development of the N12 model nailer, Stanley-Bostichhad designed, patented, manufactured, and marketed a safer “sequential-trip” trigger mechanism on most of its pneumatic nailers. The trigger mechanism on the N12 model nailer is known as a “contact-trip” mechanism, which is a spring loaded device on the tip of the nailer that engages when it is pressed against any surface. Once the trigger is depressed, the nailer will fire and continue to fire each time the tip comes into contact with an object.
Preston served Stanley-Bostich with discovery requests asking for information about the alternative design and information concerning injuries caused by the models not equipped with the alternative sequential-trip safety mechanism. Stanley-Bostich refused to provide any information pre-dating the manufacture of the N12, or any information concerning injuries caused by any model other than the N12.
Preston moved the District Court to compel discovery. The District Court granted the motion, but limited discovery to the N12 model nailer, and to the time period from the manufacture of the N12 to the date of Preston’s injury. Preston requested reconsideration of the restrictions imposed on the discovery. The District Court declined to reconsider. Preston asks this Court to issue a writ of supervisory control vacating the restrictions ordered by the District Court and compelling Stanley-Bostich to answer the discovery requests. Stanley-Bostich filed a response in which it argued the substantive merits of the District Court’s order but did not contest the procedural appropriateness of supervisory control in this case. In a March 18, 1997 order, we accepted original jurisdiction of the issue raised in Preston’s application for writ.
Discussion
1. Is a writ of supervisory control appropriate in this case?
This Court has recently clarified the standard for determining whether to exercise supervisory control.
Plumb v. Fourth Jud. Dist. Court
(1996), [
A second line of authority followed our decision in
State ex rel. Racicot v. District Court
(1990),
In
Plumb,
we held that the constitutionality of the statute in question was an appropriate issue to decide by supervisory control because the petitioner’s remedy of appeal was inadequate and the denial of a speedy remedy by supervisory control would be a denial of justice. We held that without the exercise of supervisory control “the course of discovery will be affected, the cost of preparation and trial will be affected, settlement by the parties will be rendered more difficult, and the value of any verdict will be questionable, meaning additional time and expense for a resolution of this issue by appeal and the inevitable subsequent litigation.”
Plumb,
The present case involves a restriction on the discovery of information pertaining to a products liability case. This Court has, in prior decisions, addressed the propriety of supervisory control in the discovery context.
Where the exercise of supervisory control over discovery proceedings will thwart the purposes of the discovery rules contained in
*205
the Montana Rules of Civil Procedure and where the relator has an adequate remedy of appeal, this Court will not issue a writ.
State ex rel. Guarantee Insurance Co. v. District Court
(1981),
In
State ex rel. Burlington Northern R.R. Co. v. District Court
(1989),
In
Kuiper v. District Court
(1981),
In a second case,
Jaap v. District Court
(1981),
Having reviewed the precedents of
Kuiper I
and
Japp,
the Court in
B.N.
addressed the district court’s order compelling discovery of potentially privileged material. The district court had ordered the defendant to produce certain work product and had enjoined the defendant from engaging in further discovery until it complied with the discovery order.
B.N.,
The defendant contended that if it were to disclose privileged material then “ 'the harm is complete and cannot be rectified on appeal.’ ”
B.N.,
Our recent decision in
Plumb
sanctions the exercise of supervisory control in order to prevent a litigant from being placed at a significant disadvantage and to prevent unwarranted expenses and delays in the ultimate resolution of the litigation.
Plumb,
We hold that a writ of supervisory control is appropriate in the instant case because, as explained below, the District Court is proceeding under a mistake of law which does a gross injustice to Preston by placing him at a significant disadvantage in litigating his case. Under the circumstances presented, remedy by appeal would be inadequate.
The District Court’s order restricts the scope of Preston’s discovery to information about the N12 model nailer only, and to information on the N12 model nailer from the time of manufacture to the date of Preston’s injury. Preston argues that the District Court is proceeding under a mistake of law in that information outside of the scope of the District Court’s order is discoverable pursuant to Rule 26(b)(1), M.R.Civ.R, which provides:
*207 Parties may obtain discovery regarding any matter, not privileged, which is relevant to the subject matter involved in the pending action.... It is not ground for objection that the information sought will be inadmissible at the trial if the information sought appears reasonably calculated to lead to the discovery of admissible evidence.
Preston’s claims of personal injury are based on Stanley-Bostich’s alleged liability for defective design of its N12 model nailer. In particular, Preston is claiming that Stanley-Bostich is hable for its failure to implement a safer design for the nailer when Stanley-Bostich knew of the dangerous nature of the N12 model nailer and where an alternative design existed.
This Court has recognized a strong public policy in permitting broad discovery concerning defective and dangerous products to promote the public safety.
See Kuiper I,
In determining whether the District Court has made a mistake of law in restricting discovery, we will examine the court’s discovery restrictions separately.
a. Did the District Court err in denying discovery of evidence of substantially similar injuries caused by the same design defect in other product models manufactured by the Defendant?
As previously stated, the District Court in this case limited discovery to injuries caused only by the N12 model nailer thereby excluding injuries caused by similar nailers with the same trigger mechanism. Rule 26(b)(1), M.R.Civ.P, provides that any information “reasonably calculated to lead to the discovery of admissible evidence” is discoverable. Additionally, this Court has recognized that evidence of other injuries caused by similar products is relevant and
admissible. See Kuiper v. Goodyear Tire & Rubber Co.
(1984),
In
Kuiper II,
the plaintiff was injured by an exploding multi-piece wheel rim manufactured by the defendant. The plaintiff introduced evidence of eighty-six injuries caused by the same type wheels and
*208
by other multi-piece wheels.
Kuiper II,
A concerted effort should be made by that court to allow the admission of evidence of only those accidents where both the product and the circumstances surrounding the accident were similar to the case at bar.
Kuiper II,
We stated further, in another decision, that the circumstances of other injuries need not be identical to be admissible.
Krueger,
Stanley-Bostich contends that these cases illustrate that the other models of nailers about which Preston seeks information are not similar enough to the N12 model nailer to withstand the “similar injury” standard. Without necessarily agreeing with this contention we note that the standards referred to in the above-mentioned cases govern admissibility of evidence, not discovery of evidence. As we stated above, discovery requests are to be construed broadly in favor of disclosing any information tending to lead to admissible evidence. Whether that evidence is admissible is for the court to decide at trial, not for Stanley-Bostich to determine at the discovery stage of proceedings.
*209 In another case in which Stanley-Bostich was the defendant in a products liability action concerning a model N16CT pneumatic nailer, and where Stanley-Bostich attempted to limit discovery of other accidents, a United States district court stated:
In the context of discovery of information relating to similar products, the defendant should not be the final arbiter of substantial similarity. Rule 26 provides that requests for information need only be calculated to lead to the discovery of admissible evidence. The standard for relevance under Rule 26 is less demanding than the standard for admissibility at trial [citation omitted].
Drabik v. Stanley-Bostich, Inc.,
(W.D. Mo. 1992)
A plaintiff in a products liability action must prove that the product was sold in a “defective condition unreasonably dangerous to a user....” Section 27-1-719(2), MCA. Evidence of injuries caused by similar models is relevant to both the “defect” and the “danger.” In the instant case, Preston is also suing for punitive damages. In order to prevail on his claim for punitive damages, he will have to prove that the defendant acted with indifference to the “high probability of injury to the plaintiff.” See § 27-1-221(2), MCA. Evidence of injuries caused by similar models is also relevant to this issue in that the existence of similar injuries tends to demonstrate the manufacturer’s knowledge of the “high probability of injury.”
Preston seeks discovery about various product models which utilize the same allegedly defectively designed contact-trip mechanism that caused Preston’s injury in this case. Evidence concerning similar models is commonly held to be discoverable when the different models contain the same alleged design defect.
See Krueger,
We hold that the District Court made a mistake of law in restricting discovery to the N12 model nailer only and that this mistake of law will significantly disadvantage Preston in litigating his claim as he is without the means to discover evidence that is not only relevant, but crucial, to his theory of the case.
b. Did the District Court err in limiting discovery to the time period beginning with the manufacture of the N12 model roofing nailer and ending with the Plaintiff’s injury?
The District Court’s time frame limitation prevents Preston from discovering evidence regarding the alternative design and evidence of similar injuries prior to Stanley-Bostich’s manufacture of the N12 model nailer in 1983, or dated after Preston’s injury on August 5,1991.
Preston argues that information as to similar injuries is reasonably calculated to lead to discovery of admissible evidence relating to unreasonably dangerous design, alternative design, and punitive damages. We agree. Preston argues that Stanley-Bostich designed the safer sequential-trip mechanism in the 1970s and made the decision to discontinue this alternative design in most of its main line nailers in 1973. The engineering and marketing decisions made in the 1970s are relevant to whether the contact-trip mechanism in the N12 model nailer was “unreasonably” dangerous. Furthermore, evidence of alternative designs is only admissible where the alternative design existed prior to, or concurrent with, the manufacture of the product in question.
Krueger,
Evidence of prior injuries is also relevant to a punitive damage claim in that the plaintiff must show that the manufacturer had notice that its product was dangerous and caused injuries before it sold the product in question. In restricting discovery to injuries occurring after the manufacture date of the N12 model nailer, the court arbitrarily restricted information to injuries caused by only that nailer. The court’s order, in effect, requires that the product be the “same” rather than merely “similar.” We have already held that *211 “similar injuries” includes injuries caused by similar products with the same design defect. In precluding discovery of facts occurring before the manufacture date of the N12 model nailer, the court impermissibly denied Preston access to information reasonably calculated to lead to discovery of admissible evidence on the issue of punitive damages.
Although evidence subsequent to the date of injury is not relevant to the alternative design issue, it is relevant to the unreasonably dangerous design element of Preston’s case. The fact that the same design defect continues to cause injuries is relevant to establishing the dangerousness of the product.
See Jackson,
We hold that the District Court made a mistake of law in restricting discovery to the time period from the date of manufacture of the N12 model nailer to the date of Preston’s injury. If Preston is forced to proceed to trial without information which could reasonably lead to the discovery of admissible evidence which is crucial to the proof of his claim, he will be greatly disadvantaged in the litigation of his case.
Allowing the District Court’s discovery restrictions to stand in this case would not only unfairly disadvantage Preston but would defeat the purpose of the Rules of Civil Procedure in that it would require Preston to endure the time and expense of trial and an appeal before obtaining discoverable material essential to his case. We therefore vacate that portion of the District Court’s order that restricts discovery to injuries caused by the N12 model nailer only and to injuries occurring between the date of manufacture of the N12 model nailer and the date of Preston’s injury. We remand for further proceedings consistent with this Opinion and Order.
DATED this 10th of April, 1997.
