During an interview on The Joe Rogan Experience, The Undertaker revealed he is currently working for WWE under a legends contract like that of Ric Flair, Hulk Hogan etc. He revealed the news wh talking about drug testing in WWE.

"Before I switched my contract , now I’m not a Talent, I’m a Legend , I only worked two or three times a year, but I was under a regular contract. Under a regular contract, and this is if you tested clean, you had to have four mandatory piss tests and two blood tests every year. They’d get to the end of the year and I’d get a call, ‘Go to the lab and do a piss test.’ I hadn’t been in the ring in 6 or 7 months, but they’d look at the book and say ‘oh, we forgot about him.’ So you get the piss test done, but that was only three. Sure enough, next day, another phone call, ‘go back to the lab.’ 

They’re totally random, they just show up. I was home, that’s why I didn’t get tested until the end. I know what the protocol is and if anyone could get out of it, it would be me, and I couldn’t get out of it."

The Undertaker signed a contract recently until 2035.