[Wolfstar]

Isn't possession of drug paraphernelia a crime in and of itself? Hence the folks in your hypothetical "house in LA" would still go to jail even though no actual drugs were found.

[Luis Gonzalez]

As far as I know, paraphernelia are the objects people use in the act of ingesting/inhaling drugs.

That lab would be the method of production of the drugs, which would provide conclusive evidence of the criminal act of manufacturing drugs.

In either case however, my theoretical applies.

We found the labs, they were making WMD's.