It's a hodge-podge, from what I've seen. Also depends if it's city, county, state, or federal. Federal is the most intrusive. And once on premises, I'd presume they can do whatever that jurisdiction wants to, none of the "TSA only at CP and gate".

It's a nasty catch-22. The courts deal with some really nasty people, so they have to have security. Yet intrusive security changes people's behavior to be more extreme. Both parties bring something to the table, and both make it worse.