Unfortunately, fent is turning up in a lot if things (illegally bought drugs). People need to realize no matter what you think you're taking; there's a good chance it has fent in it at this point.
A lot of media stories make it sound like tons of people are suddenly abusing fent. Idk, who knows what some of them thought they were taking, we only knew they died of fent. (General cases, we don't know yet about this one).
Like that case i had been talking about where a guy who supplied illegal drugs. Most of the dealers (who were also prosecuted) had no idea who they were really buy from... They thought they were buying from someone they knew. I think only a few people actually knew this was the guy. He was high up in organized crime. So, you imagine, at that point it's all about $$$ to him. He has no idea who is specifically buying, these are just order to fill to make $$. Fent wasn't a thing yet and that guy's in prison. But, there is someone supplying way up the line who is just after $$$ and otherwise doesn't care. And fent is a thing now.
I would think the police could recognize a lab used for making drugs. So, just by the fact i have not heard of total chaos drama happening at that house, i imagine they didn't find one. I have no idea what it takes to break down a lab or how long it takes (if someone was inclined to make one and then take it down because reasons). I also don't know if it still leaves evidence. I am really just thinking there wasn't one.