It's becoming harder in many states to get a commercial drivers license, and rightly so. It's becoming even harder to get hazmat endorsements and rightly so.
But, unless the state has the resources to conduct background investigations on every applicant some are still going to get them using forged documents as some of these people obviously did. Florida now requires a certified copy of a birth certificate in order to receive a CDL. When I moved from Virginia back home to Florida I had to wait until I received a new official copy of my birth certificate before I could transfer my CDL to Florida even though they had records indicating that I had held Fla license in the past. So they are doing something, but like anything there will be people getting around it.