The plaintiffs, Vincent Antkiewicz and his brother, Roger Antkiewicz, appeal from a summary judgment granted on November 9, 1977, by the Macomb County Circuit Court in favor of the defendants, City of Roseville, Detective Donald Salatka of the Roseville Police Department, and Sergeants Ralph Junga and Raymond Jensenius of the Roseville Fire Department.
The plaintiffs operated the Ambassador Restaurant in a building located in the City of Roseville which was owned by defendant Gino’s, Inc. After several months of operation of the restaurant, a fire occurred on February 9, 1975, resulting in extensive damage.
An investigation of possible arson was initiated by the police department and fire department of Roseville. The plaintiffs were advised to remain off the premises and not to remove any items during the investigation.
On April 15, 1976, 14 months after the arson investigation had commenced, the plaintiffs were charged with the burning of insured property with intent to defraud, MCL 750.75; MSA 28.270. On the sixth day of that criminal trial, a directed verdict was entered in favor of the plaintiffs.
The plaintiffs filed a four-count civil complaint in this case on June 23, 1977, the third count alleging liability of the City of Roseville and its agents, Salatka, Junga, and Jensenius, arising out of the conduct of the arson investigation and the decision to bring charges. The fourth count of the complaint alleged a civil conspiracy among all of the defendants to deprive the plaintiffs of rights and property, resulting in humiliation and anxiety, and a loss of reputation and good will.
The City of Roseville and the three named agents filed a motion for summary judgment or, *393 alternatively, accelerated judgment on the grounds of governmental immunity. The motion was granted. The plaintiffs filed a motion to set aside the order granting summary judgment, which was denied on January 3, 1978.
I
Our first determination is whether or not the lower court erred in granting summary judgment. When reviewing the granting of a motion for summary judgment under GCR 1963, 117.2(1), we regard as true the factual allegations of the plaintiffs as well as any conclusions reasonably drawn therefrom.
Armstrong v Ross Twp,
"Except as in this act otherwise provided, all governmental agencies shall be immune from tort liability in all cases wherein the government agency is engaged in the exercise or discharge of a governmental function. Except as otherwise provided herein, this act shall not be construed as modifying or restricting the immunity of the state from tort liability as it existed heretofore, which immunity is affirmed.”
None of the exceptions set forth in the act is applicable to this case. See MCL 691.1402, 691.1405, 691.1406; MSA 3.996(102), 3.996(105), 3.996(106).
Thus, the essential question is whether the in
*394
vestigation and subsequent prosecution for arson is a "governmental function” for purposes of the governmental immunity statute. The Michigan Supreme Court recently dealt with the construction of the term "governmental function” in
Parker v Highland Park,
Justice Moody, in a separate opinion, declined to embrace such a limited construction of "governmental function”. Instead, he reached the following conclusion:
"To delineate a complete and balanced definition of governmental function within a simplistic format would be presumptuous. However, as a basic guideline, the crux of the governmental essence test should be founded upon the inquiry whether the purpose, planning and carrying out of the activity, due to its unique character or governmental mandate, can be effectively accomplished only by the government. Unless liability would be an unacceptable interference with government’s ability to govern, activities that fall outside this parameter, although performed by a government agency, are not governmental functions and therefore not immune. (Emphasis supplied.)404 Mich at 200 .
Justice Moody’s construction, employing the qualifier "effectively”, encompasses the "can only be done by the government” construction set forth by Justices Fitzgerald, Levin, and Kavanagh, and we, therefore, regard it as the dispositive test. Thus, our inquiry when determining whether an *395 activity is a governmental function is whether the activity is one that can be effectively accomplished only by the government.
Turning to the facts of the instant case, we have little difficulty in concluding that a police and fire department investigation of arson, having as an aim possible criminal prosecution, and the subsequent prosecution are governmental functions.
The determination of whether the underlying activity is a governmental function is only the first step in deciding the immunity question. We must next determine whether the specific acts complained of were in the exercise or discharge of that function. See
Cronin v Hazel Park,
A recent Michigan Supreme Court decision,
Lockaby v Wayne County,
*396
In the instant case, the counts in the plaintiffs’ complaint allege the commission of the intentional tort of trespass.
2
In Michigan, trespass has been defined to be any unauthorized intrusion or invasion of the private premises or lands of another.
Giddings v Rogalewski,
II
Our next determination is whether or not the *397 lower court erred in granting summary judgment in favor of defendants Donald Salatka, Ralph Junga, and Raymond Jensenius. Since these defendants were agents of the City of Roseville, the trial court considered them to be shielded by governmental immunity along with the city.
The liability of a public officer for tortious acts committed in the scope of his employment is determined by deciding whether the acts of the officer are "discretionary” or "ministerial”. 3 Discretionary acts are normally protected under governmental immunity; ministerial acts are not. Prosser, Torts (4th ed), § 132, pp 989-990.
The difference between discretionary and ministerial acts is one of degree. Discretionary acts are those of a legislative, executive, or judicial character.
Sherbutte v Marine City,
Ministerial acts are those where the public officer has little decision-making power during the course of performance; the officer’s acts are primarily in response to orders. See Prosser,
supra
at 990. Prior Michigan decisions have deemed ministerial acts to include the issuance by a county drain commissioner of partial payments for a drain construction,
People, for use of Lapeer
*398
County Bank v O’Connell,
Reversed and remanded as to defendants City of Roseville, Donald Salatka, Ralph Junga, and Raymond Jensenius. No costs, plaintiffs having prevailed only on the trespass claim.
Notes
In a separate opinion, Justices Levin, Kavanagh, and Fitzgerald stated that according to the Court’s decision in
McCann v Michigan,
The plaintiffs’ complaint insufficiently alleges the tort of malicious prosecution. The element of termination of the proceeding in favor of the accused was omitted. See
Rowbotham
v
Detroit Automobile Inter-Insurance Exchange,
The Supreme Court has not reached a consensus on the proper method to employ for determining whether public employees are protected by governmental immunity. See
Bush v Oscoda Area Schools,
