Local PG ones do not and son has been to a few college ones, on and off campus, that have not. Some others do and publicize it. Many coaches and scouts can tell without seeing a radar gun though, which is why results are important.
As I'm sure you have, I have seen a few that have the bat speed (and would have good exit velocity), but can't hit water if they fell out of a boat. So the good exit velocity doesn't help them.
No complaints on my guy, he's in a good spot with that. Needs to continue working though, as they all do.