He was cleaning it last week when he noticed a cracked area on the one-piece molded seat assembly.
When he removed the seat assembly to clean the floor, he found a plastic bag containing a substance that local police later confirmed was cocaine.
Blais speculates that a suspect stuffed the drugs through the crack to prevent police from finding them. Burrillville Lt. Kevin San Antonio says Hartford police were "apologetic" when he told them of the discovery.
Hartford police spokeswoman Nancy Mulroy said Friday that based on their past experience with drug suspects, Blais' speculation is almost certainly correct.
"It's not unusual that perpetrators or suspects try to hide stuff in the cruisers before they go to booking, where they know they'll be searched," she said.
Information from: The Call, http://www.woonsocketcall.com