Denis Cyplenkov did not compete in championships with doping tests. This is a list with armwrestlers that failed the doping test. Trust me, for each armwrestler who failed the doping test there are at least 10 who got away because they were never tested or because they used substances harder to be detected. That doesn’t mean I should put them here. And before you say anything, I want to remember you that I was the first one who pointed out this about Denis Cyplenkov (but it still doesn’t matter as long as he didn’t fail any doping test): http://www.xsportnews.com/armwrestling/denis-cyplenkov-does-not-use-the-hormone-since-november-2010/

Interesting

Koba Boss No, they can’t compete in any competition.

XSportNews.com – Armwrestling & more.
thank you for quik answer
one thing can armwreslers from list N.A. participite to europian championship ?

It is explained in header of the table N.A. = Not Announced. This means that the suspension period was not announced yet.

Cannabis is prohibited but Semerenko also had clenbuterol which is forbidden for very good reasons:
1. http://www.usada.org/substances/marijuana-faq/
2. https://www.steroid.com/Clenbuterol.php