Just because the dog alerted and the person later admitted that they had used drugs doesn't make the fact that the dog was used as justification for a search and confiscation tolerable. If they had used astrological 'cause' in the same circumstance, would you be ok with that?

"We ran his name and found out he was a Pisces. That gave us grounds to search. He had money. That gave us grounds to seize it."