Terry Watson, an inmate at the Child-ersburg Community Work Center in Alabama, appeals pro se the district court’s denial of his request for a preliminary injunction to enjoin the current procedures and practices for inmate drug testing conducted by the Alabama Department of Corrections (“DOC”) and the implementation of DOC Administrative Regulation #440 (“AR 440”). The district court did not abuse its discretion in denying the injunction. For background, see Wolff v. McDonnell, 418 U.S. 589, 94 S.Ct. 2968, 2982-83, 41 L.Ed.2d 935 (1974). The public’s interest in the administration of a safe prison system, free of drugs, is great. Besides, Watson failed to show that he would suffer an imminent, irreparable injury (one not compensable through monetary damages) in the absence of a preliminary injunction.

AFFIRMED.