The British boxer, 26, is eyeing a return to the ring after failing two drug tests last year.
Benn was due to fight Chris Eubank Jr in October, however his grudge match was cancelled after he tested positive for the banned substance clomifene.
He is now aiming to fight in the summer and Hearn stressed that the drug testing progress will be stringent to avoid a repeat of the situation.
Hearn told The Dazn Boxing Show: “You know, whoever Conor Benn fights next, the testing process is going to be more rigorous than any fight that has ever existed, right? Let’s see if all of a sudden, if there’s a dip in his performance, and he don’t punch as hard—absolutely ridiculous, you know. I cannot believe the relentlessness of some people, with agendas, but I’ve never seen so many people so passionate about the subject. All of a sudden.
“One thing that makes me laugh is people who say, ‘I mean, look at Conor Benn. I mean he went from getting dropped by a guy who was seven and three to [becoming] an absolute killer,
“Well, no one was saying he was a killer. Everyone was saying he was just fighting bums. So, when he stopped [South African welterweight Chris] van Heerden and knocked out [American welterweight Chris] Algieri, now everyone is making out that he was superhuman. But at the time, he was overrated. Algieri was a light welterweight who was finished. Van Heerden hadn’t boxed in a year and a half, he was shot. You’ve got pros coming out saying it was obvious [Benn was doping]—Do me a favour."
The promoter added: “Let’s see if all of a sudden, if there’s a dip in his performance (in Benn's next fight), and he don’t punch as hard - absolutely ridiculous. I cannot believe the relentlessness of some people, with agendas, but I’ve never seen so many people so passionate about the subject.”