From an article in the Japan Times, it seems that NOVA's drug testing policy is still on the books, though thanks to the formation of the union and an Osaka bar association ruling against it, it has never been used.

I'm not surprised a lot of NOVA employees haven't heard of the union, the company does its best to supress knowledge of it by transferring or not renewing the contracts of employees involved in union activities. I've read quite a bit about it here:

www.letsjapan.org