MMAFighting.com‘s Ariel Helwani has it:
According to NAC executive director Bob Bennett, the commission has already tested Belfort three times leading up to his UFC 184 middleweight title fight against Chris Weidman. Belfort has passed all three tests, and Bennett said the NAC plans on randomly testing Belfort again.
“Both him and his wife have been extremely cooperative, polite, professional and friendly throughout this process,” Bennett said. “They have been consummate pros to date.”