Can Customs X-Rays Detect Toxic Chemicals?

[kenny1999]

Could customs x-ray security check find out if there is trace of toxic chemical left in the product? I do NOT mean illegal drug because it
is supposed to be found out, but how about if there is any trace of other toxic chemicals? Could it be found out?

 

[russ_watters]

Could customs x-ray security check find out if there is trace of toxic chemical left in the product?

No, x-ray machines do not detect specific chemicals.