The U.S. Anti-Doping Agency tested 586 UFC athletes 2291 times in 2016, up significantly from the 353 tests they conducted in 2015, their first year (six months, really) working with the UFC.

The new program has caught several fighters for performance enhancing drug use and athletes are definitely tested much more often and under stricter circumstances than in the past.

Under the UFC Anti-Doping Policy, fighters are subject to random test at any time and any place.

The below information is based on all in- and out-of-competition blood and urine samples collected by USADA. The current definition for in-competition is identified as the six hours prior to weigh-in and six hours after the bout and fighters are usually given at least one test in this time span. Out-of-competition is anything outside of this window.

A fighter’s past failures do not necessarily mean they will be tested more. Only two fighters in the top 10 have failed a test in the past but one of them just happened to be the most tested fighter in 2016.

Let’s take a closer look at which fighters had USADA knocking at their door the most last year.