Unlike ceramics, plastics don't have to be fired at high temperatures and can be imbedded with copper circuits.

FORBES: It's all in the packaging

But the fact is that these test kits are really designed only to detect surface lead and not the lead that might be imbedded beneath the surface.

NPR: Do Home Lead-Testing Kits Work?

If you can afford the fees imbedded in that product, then IMHO, you should be yachting, not working for a school district.

FORBES: With Pensions At Risk, Government Workers Must Demand Better 457 and 403(b) Retirement Plans