Cleaning weed out of truck?

My dad smokes weed and he recently gave me his old Ford F-150, I drive to school, and I'm worried that there's a piece of weed in there that I missed while I was vacuuming and the school gets its annual drug search, then I get charged for "possession" of weed that was never mine

Call a carpet cleaning place to steam clean it out for you.

Go to the police station. Tell them you have bought this truck and want to make sure that it is pot free and could you borrow their dog for a moment.

3 POINTS

You certainly can be charged and a dog can detect even a
small amount of weed.

Explaining that it was somebody else's weed. That may not
go over well. The school may even be obligated to call
police if they detect weed in a student's car.

I guess it is OK to ask a cop your question but I wouldn't walk
into a police station with this question.