Possibly some scammers are more sophisticated than I'd give them credit for (... depends on who they are ?). But, I suggest a VERY easy, simple, litmus test that can be applied to any suspected scammer trying to contact you.
Simply ... ask THEM to give information about YOU ... assess for yourself, if you can, what information about you they SHOULD already have, if they are really who they claim to be. The last scamming attempt I was subject to was stopped in its tracks by my asking the caller the simple question: 'If you are who you say you are, you'll have a database containing basic information. Tell me .. WHO AM I ?'
The caller abruptly rang off, and didn't call back.
Maybe in the US, scammers do more to attempt research on their hoped-for victims. But in many instances, they'll have scant info to start out with ... remember, their approach is to get information from YOU, not the other way around. Counter it by probing to see what, of a basic nature, they can tell you they already have (and should have !) on file about you. My guess ... almost always, they'll fail that test.