Utah politicians trying to block new supplement laws.

The U.S. Olympic team and major sports leagues are pressuring Congress to crack down on dietary supplement makers who secretly slip designer steroids into their products.

The U.S. Anti-Doping Agency launched the joint effort under the name Supplement Safety Now earlier this month, targeting lenient regulations that allow rogue companies to keep "selling this poison to our kids and profiting from it greatly," says Travis Tygart, the agency's CEO.

USADA has recruited a number of supporters for its supplement campaign including professional football, baseball, basketball and hockey leagues, as well as college athletics.

But the group faces stiff resistance from the supplement industry and its key political backers -- led by Sen. Orrin Hatch and Rep. Jason Chaffetz, both Utah Republicans who count this sector among their top campaign contributors.

While they respect the goals of the anti-doping agency, they believe the Food and Drug Administration already has the authority, just not enough funding, to go after these unscrupulous supplement companies.

"There are sufficient laws on the books," said Chaffetz, a former Nu Skin executive who is now the co-chairman of the House dietary supplement caucus. "If you are mislabeling your product, the FDA should go after you. And if there are banned products on the shelf, the FDA should go after them. The law already allows for that."

In the sports world, it has become cliché for an athlete to blame a spiked supplement for a positive steroid test and these claims are usually met with skepticism. But it does happen.