the deal with fingerprinting...
if the parents touched it and moved it, their prints are now on it... if they didn't touch it, then their prints would never have been on it.... unless they planted that bag... earlier, for brian.
I don't think they planted it yesterday, but I think they may have dropped it off at some point earlier, when Brian first leftor when they came an got the car. when they went searching yesterday finding that bag to them meant brian never go it, so they realized if fingerprinted their prints would be on it... maybe or maybe not brians, but reason to go ahead and pick up without gloves to avoid being charged