Losing one's license, as in railroad's case, may depend on what state you live in. I believe that all boards of nursing must prove violation of your nurse practice act via due process before action can be taken on a license. What "proof" is there against you, railroad? Was sloppy charting involved? If so, even if they can't prove drug diversion, they may be able to prove that you violated hospital policy and get you on another charge more related to incompetence rather than diversion. Diversion is a serious charge as is being terminated for suspected diversion if diversion didn't occur. Either your former workplace has some hefty evidence against you or you have reason for suing them. IMO, providing a drug screen days after the event won't be very helpful except to show that you were not using those drugs that take more than a few days to be excreted...like marijuana, etc. Anyway, I hope this works out in your best interest. If you really are using, I hope you get the help you need and if you aren't, I hope you get $$ for your pain and suffering. Z~