Even though there has never been a case of a child being hurt by tampered with Halloween candy, I still check. We used to do the "Cosby Method." One bag from people we know, they can eat some of that as soon as they get it (but not all of it) and one "other bag" from people we don't know, that Mama has to see before they get to eat it.
I throw away all that isn't wrapped, as well as any apples (really people still give them, mostly old ladies) cookies that aren't factory made etc.
When they were really little, I could take what I wanted (mean mean Mama) now they keep track, so I have to ask for some.