That you can't tell is and has always been exactly the fucking point. Of course you can't tell, unless - as I've pointed out a hundred times - you pull up their shorts and check. This is the exact genesis of the "Judy wants to check your junk" meme - there simply is not a way to know.
Didn't stop this dude from getting his ass beat for doing exactly what conservatives has insisted he has to do against his will.
Maybe, instead of calling the cops, just let the person use the restroom in peace and go about your day? Is that really a lot to ask? If they attack you in the bathroom that's a crime whether the person is trans or not, that is when the cops should be called. Criminalizing existence for certain people is not the answer.
Has she said "murder"? No.
Has she said "you can be sure I’ll be cutting his dick off" about a trans woman entering the women's room? Yep. Believe she has advocated for killing them as well, but don't have the direct evidence of that.
Now, do I think JudgeJudy would ever do that? No, of course not. She likely knows she's almost certain to get her ass beat trying to do that. But it says a LOT about her that she openly fantasizes about that, and a lot about this board that very few people call that sort of behavior out.