How Does this Trick-or-Treat Ritual Go Again?

Now that October’s behind us, let’s reflect:

1. Did you check your Halloween candy before eating it?
   
2. What precisely does one look for when checking said candy?
   
3. Who is the best candy-checker you’ve ever met and what made them so good?
   
4. What happens if you don’t check the candy?
   
5. Is there candy that need not be checked?
   
6. Do you check candy at Valentine’s Day and other (holi)days?
   
7. Are there other treats or items outside of candy that should be similarly examined?
   
8. Can you hire someone to check the candy for you?
   
9. Does any store sell pre-checked candy?
   
10. Who was the first candy checker?