Not an idea that I have :-)
I can't see any constitutional issue, as long as the owner or tenant of the property freely consents to the search.
And I can see why parents might like police help. The police are experienced at finding things people don't want found, and they (should, if they're the anti-gang unit) recognize gang-affiliation items that a parent might miss. I don't know what local gang clothes and marks look like!
My apologies, wasn't implying that you had that idea! I just know too many parents who turn a blind eye and make every excuse so they don't have to deal with what's really going on. It just burns me up!
CC&E