He won't find it and if he did he wouldn't care. I have found sex toys in peoples glove boxes when looking for their wheel key, I'd rather stumble on a jar of weed any day of the week.

the only reason he'd look at the spare is for a multi point inspection, and as a mechanic myself i never check the spare during a multi point..

Take it out of the car tonight and then you won't have to wonder.

Usually no. Now will the visiting Policeman that has a drug sniffing dog take an interest in your car is something entirely different.

If he has no reason to be back there they probably won't look. You should share your jar-o-weed with everyone who answers.

Does a mechanic have a reason to look there?