I'm going to an event soon and the last time I was there there were some of those awful street preachers with megaphones shouting bigotry. They're a nuisance and nobody wants them there, but it's a public festival and evidentially they're allowed to be there.
I tried looking online (
)and most of the advice was stupid lib shit, ranging from, "Call the cops and tell them they're violating statute blah blah blah" or, "Just ignore them, you can't change their minds and engaging just feeds their persecution complex." Obviously the cops do nothing, I don't care about changing their minds or what they think I just want to shut them up. But I also don't want to get arrested and if possible, it'd be nice to avoid disturbing the other people further.
Most likely, I'm just gonna have to endure it, but I thought I'd raise the question for brainstorming bc it feels like a common enough situation that other people will encounter it too. Best I can think is screaming something back at them 
UPDATE: I ended up just wearing a bunch of pride stuff and then they weren't even there lol
So this is hypothetical and I've never tried it out, plus it depends on the drug laws in your region, but if you know what terpenes drug dogs are trained by then you can get your hands on something completely legal that also shares that same terpene and use that to screw with people.
For example, drug dogs trained to detect cannabis are trained to smell caryophyllene oxide, and black pepper (especially black pepper essential oil) is high in this compound.
If you were at a festival and there were drug detector dogs at the gate, you could discreetly disperse this (especially away from the gate but close enough to it) and it would interfere with the ability of dogs to detect it.
You could also get that odour onto someone else to get the police to harass them, if they had dogs or you knew they were going to bring them.
This isn't something that I've ever tried and you want to be real fucking careful because the pigs would put you up on charges of obstruction of justice or some bullshit if they think there's even a slight chance of those charges sticking but last time I consulted my naturopath, essential oils are not a crime.
Good ideas