Legal Question in Criminal Law in Florida

Yes you could report a weed dealer. Although you would be admitting to having bought and consumed marijuana, if it no longer exists and you aren’t in possession of anything illegal, there would be insufficient evidence for a criminal prosecution. In other words, a confession without the weed won’t stand.

I’m sure there are cops that would be willing to use you as a confidential informant. I don’t know how interested the cops are in catching a weed dealer (nowadays they’d rather spend their time trying catch dealers or cocaine, opiates, fentanyl, or heroin) but you can certainly offer your services.