From our friends at the Environmental Working Group [1]:
Beware if your children put the CSI: Crime Scene Investigation™ Fingerprint Examination Kit on their holiday wish lists.
It doesn't take a sleuth to detect danger in these kits -- the fingerprinting dust contains tremolite, one of the most lethal forms of asbestos.
Even worse, children are supposed to blow on the asbestos-contaminated powder after dusting for fingerprints, which means they will likely inhale lung-damaging, cancer-causing asbestos fibers.
Well, that's one way to teach the kiddies about crime.
Links:
[1] http://www.ewg.org/node/25714