That would only indicate what amount of drinking he has been doing over the last 4 weeks. (iigic) Doesnt touch any of the other claims, and he has been director for a longer than 4 weeks.
Also if the director of the FBI (even a shit one like this numpkin) cant cheat a drug/alcohol test than dismantle the whole org anyway.
I mean, id probably be ok with them being dismantled anyway... but they do serve a couple important functions. I think.