James L. Webb, an inmate of the Indiana State Prison, lost 90 days of good time credit when prison authorities determined that he had used marijuana based on a positive urinalysis. After exhausting his administrative remedies, Webb filed a petition for a writ of habeas corpus, arguing that because prison officials failed to maintain an adequate chain of custody for the urine specimen, their disciplinary decision lacks “some evidence” to support it.
See Superintendent, Mass. Correctional Inst., Walpole v. Hill,
I.
The Indiana State Prison randomly tests its inmates for drug and alcohol use. At 4:80 a.m. on March 9, 1996, the prison facility at Michigan City collected a urine sample from Webb. The chain of custody slip confirms that the sample was sealed in Webb’s presence: it bears his initials as well as the name of the collecting officer. R.6 Ex. A3; see also id. Ex. A2. The parties agree that two subsequent entries on the custody slip reflect that the specimen arrived at the labоratory of a local hospital on March 12, still with the seal intact. A March 16 toxicology report, bearing Webb’s name and prisoner number and the same toxicology number as the chain of custody form, indicates that the specimen was analyzed on March 13 and tested positive for cannabinoids, the active narcotic agent in marijuana. R.6 Ex. A3. Neither the toxicology report nor the chain of custody form, however, identifies the technician who tested the specimen, nor does either document confirm that the specimen remained sealed until it was tested. The prison received the test results on March 25. R.6 Ex. A2.
Based on the lab report, thе prison charged Webb with the unauthorized use of a narcotic drug. R.6 Ex. A4. Webb contested the charge, asserting that “[tjhere is no certified chain of custody, and there is no name as to who did the test.” R.6 Ex. A6. A hearing took place on April 1, 1996. There, with the assistance of a lay advocate, Webb reiterated his challenge to the sufficiency of the evidence. The hearing officer nonetheless found him guilty of the charge, “[biased on the test results,” and recommended that the prison deprive him of 90 days’ credit for good time. R.6 Ex. A5. A reviewing officer found no reason to disturb either the finding that Webb had used marijuana or the recommended sanction. That officer explicitly rejected Webb’s assertion that the chain of custody had been broken, reasoning that the handling of his specimen was adequately documented on the toxicology form. R.6 Ex. A7. A final review by a disciplinary review manager likewise rejected Webb’s argument. R.6 Ex. A9. Indiana does not provide for state-court review of prison disciplinary decisions,
Hasty v.
Broglin,
Webb filed a habeas petition alleging thаt the prison had violated his right to due process. The district court denied Webb relief, concluding that the evidence underlying the disciplinary decision satisfied the standard articulated in
Hill,
II.
A.
When a state prisoner faces thе loss of good time credits for alleged misconduct, he is entitled “to those minimum
*652
procedures appropriate under the circumstances and required by the Due Process Clause [of the Fourteenth Amendment] to insure that the state-created right is not arbitrarily abrogated.”
Wolff v. McDonnell,
The toxicology report and the chain of custody slip constitute “some evidence” supporting the decision to impose disciplinary sanctions upon Webb. The parties agree that the сhain of custody slip confirms the collection of the urine sample from Webb and sealing of that specimen, the transmission of the specimen to the hospital laboratory, and the receipt of the sample by the hospital in sealed condition. The toxicology report, which bears Webb’s name and prisoner number and the same toxicology number as the chain of custody form, 2 in turn reveals that the sample was analyzed within rоughly twenty-four hours after it arrived at the hospital and that Webb’s urine tested positive for cannabi-noids. Together, these documents establish that Webb’s sample was delivered to the hospital in sealed condition, that the hospital laboratory tested the sample, and that the analysis revealed Webb’s use of marijuana.
We regard the two omissions in the documentary trail as significant, but not so material as to preclude prison officials from relying on the documents as evidence of Webb’s marijuana usage. Notwithstanding the omission of the name of the technician who tested Webb’s specimen, there is no reason to doubt that the laboratory actually analyzed the sample: the toxicology report lays out the various substances for which Webb’s urine was screened and the results for each. Similarly, although the chain of custody form does not confirm that Webb’s speсimen reached the technician in a sealed condition, the record gives us no reason to suspect that the specimen may have been opened and tampered with during the twenty-four hour period between its arrival at the hospital on March 12 (at which point we know that it was still sealed) and its testing on March 13. The gap in the chain of custody form and the anonymity of the technician who analyzed Webb’s sample certainly leave room for the possibility that the sample was mishandled in some way; conversely, filling in those omissions would render that possibility more unlikely and enhance the reliability of the test results. Yet:
The Federal Constitution does not require evidence that logically precludes any conclusion but the one reached by *653 the disciplinary board. Instead, due process in this context requires only that there be some evidence to support thе findings made in the disciplinary hearing.
Hill,
B.
28 U.S.C. § 1915(a) bestows on courts the discretion to аllow in indigent litigant to commence a suit or an appeal without pre-payment of the filing fee. However, section 1915(b)(1) — a provision added by the Prison Litigation Reform Act of 1996 (“PLRA”) — now provides that “if a prisoner brings a civil аction or files an appeal in forma pauperis, the prisoner shall be required to pay the full amount of a filing fee.” This court’s opinions in
Newlin v. Helman,
Our holding in
Walker
does not entitle Webb to a refund of the appellate filing fee, however. As we noted in
Walker
itself, “[a] court has within its discretion to insist that litigants proceeding IFP in non-PLRA cases must nonetheless pay a fеe commensurate with their ability to do so.”
III.
Because the decision of prison officials to revoke 90 days of good time credit has the support of some evidence, we Affirm the judgment of the district court denying Webb’s petition for a writ of habeas corpus. As this case does not constitute a “civil action” for purposes of 28 U.S.C. § 1915(b), Webb was not required to pay a fee in order to file the appeal.
Notes
. The district court suggested that the loss of credits for good time served "probably does not implicate a liberty interest” under
Sandin v. Conner,
. Webb suggests that one digit in the sample’s eleven-character toxicology number may not match the number reflected on the toxicology report (Reply Br. at 3), but we disagree. Whаt he (or his counsel) reads as a "6” we believe to be a "5,” which conforms to the toxicology report. See R.6 Ex. A3.
. We note that in
Thompson
v.
Owens,
