What druggies? The only thing introduced as evidence of a drug connection was the finding of traces of marijuana and cocaine. I suspect that virtually any rental property, or even property previously owned by someone other than the current owner, will have traces of those. Heck most of the money in circulation has traces of drugs on it.
AGAIK, No one was charged with, nor convicted of any drug offenses in this incident.
The informant The warrants. The irrational behavior of the convicted murderer.