In the U.S. a request for a search warrant is supposed to list the items you are searching for. The police don't just get a search warrant and then look for something criminal. So in this case, I cannot imagine why a judge would issue a search warrant for Lark, since he has done nothing illegal. There isn't an arrest warrant out for him. But let's assume they do get a search warrant to look for Lark. They can only look for places Lark could be hiding, so the police would not be able to open any desk drawers, nightstand drawers, etc. Anyplace too small to hide a human would be off limits.
Add to that CA's very lax laws on marijuana possession and growing for personal use, the LEOs really wouldn't care. I think Brad nailed it that the Hillsborough police officer was getting payola from Dan to find Lark; otherwise who would give a shit were he was, dead or alive.