Why would they send drug-sniffing dogs into the building? They can’t prosecute him for possession, because he’s dead. What would be the point of even finding his drugs in the building?
If nothing else it would show his motive for fleeing, and the cops’ probable cause to apprehend him. I’ve heard there was heroin in his system. Media is quiet about that one. He may have swallowed the drugs then had a violent seizure in the van.