“the raid itself only turned up a small amount of cocaine and marijuana — but none of the heroin police expected to find”
If the toxicology is negative then something is very wrong.
This is obviously a screw up and a cover up. Odds are the couple were misidentified, totally innocent or any wrongdoing, the cop in charge lied to get the warrant, the cops went in like D-Day and killed the occupants, and any drugs found were planted by the cops. This whole thing stinks. Read Sidney Powell’s book “Licensed to Lie” for a sense of just how corrupt the Houston Police Department is.