You've got a lot more to worry about with domestic nuts tampering with candy than with terrorists. The normal rules still apply:
children escorted at all times;
every piece of candy to be fully inspected
by you to insure factory packaging;
nothing homemade unless you trust the source implicitly;
anything that looks to have been tampered with gets tossed;
anything that's soft and can have something inserted is either tossed or cut in half to insure no problems;
and absolutely no sampling until after all candy. Keep a small store of candy with you to give to them to tide them over.
children escorted at all times;
every piece of candy to be fully inspected
by you to insure factory packaging;
nothing homemade unless you trust the source implicitly;
anything that looks to have been tampered with gets tossed;
anything that's soft and can have something inserted is either tossed or cut in half to insure no problems;
and absolutely no sampling until after all candy. Keep a small store of candy with you to give to them to tide them over.