Speeding Ticket Issuance Laws?

I need to settle an argument with my significant other lol ..

She says she thinks Kentucky State Police can just mail out speeding citations without pulling someone over. So I guess, take their picture with the speed and a week or so later they get a ticket in the mail.

I argue that I didn't think it was legal to do that... Could of swore I read that in Kentucky those had to be hand delivered by the officer, and for the life of me I can never recall hearing of someone getting a ticket like that (leaving out red light camera bs)

So who is right???