The NFL has toughened up its drug policy, adding amph-etamines to the list of banned performance-enhancers star-ting this season.

Amphetamines were previously listed as a "substance-abuse drug," but are now in the same category as steroids and other enhancers that carry much stronger penalties. This season will serve as a transition year, where a first positive test would bring a warning and put a player into the drug program.

But in 2007, amphetamines will be tested for on a regular basis.

A first positive test will result in a four-game suspension, the same penalty now levied for positive steroids tests.

Major League Baseball also started testing for amph-etamines this season as part of its steroids policy.