Tabitha, that is the way the law was written. The end manufacturer is responsible for testing. Many supplies are considered general consumer products and do not require testing. If it is specifically targeted to children, eg, a child's art kit, then it has to be tested (but then that's a competed item.)
The law was passed and signed in to law in Aug 2008. It's not new. And your congressperson may not have even been around in 2008, their terms are only 2 years unless they are reelected. And even if they were around no one read the bill, they voted on it because people freaked out over the lead tainted toys from China. They labeled it a lead law, and of course "no one wants to have lead in children's products".
As to MSDS they do not test for lead using the test the CPSC wants, nor do they show it in the manner that the law states.. And how do you allow 1 MSDS and not all MSDS?
And the law is far, far better than it was in the beginning. There were no exemptions, and the only fabric allowed was undyed. Meaning white or natural. No colors, no prints.