Where is the PROOF they were selling?
There was enough evidence to get a search warrant. That they started shooting when police tried to enter their premises is evidence that they were guilty of something or paranoid.
https://abc13.com/disabled-veteran-and-wife-killed-in-shootout-with-police/5110865/
Police recovered two shotguns and three rifles from the residence and seized marijuana and a white powder they believe to be either cocaine or the powerful synthetic opioid fentanyl, Acevedo said.