Players now will be subject to a maximum of six random drug tests during each offseason, up from two, NFL spokesman Joe Browne said.
The league and union also had recently agreed to add new substances to the list of banned performance enhancers, to put in writing previously agreed-to policies to test for designer steroids, and to lower the testosterone ratio threshold.
The Brown County (Wis.) sheriff's department said deputies went to his residence after a 911 call ended with a hang-up. The Pro Bowl player was arrested at about 10:10 p.m. Monday after officers believed a domestic violence incident happened.
Green was taken to jail, but he posted bond and was released.
As part of a plea agreement, Hopkins was sentenced to a year of probation and must attend anger management counseling.