First let me commend you on your actions! The situation you were placed in on that night is the most difficult one someone in your position can be placed into and you did your best. As what has happened after that night tells me this is a case for OSHA to investigate. I say this, not because I believe OSHA should be called to handle company matters, but if what you are telling us is 100% of the entire picture, then people, such as your supervisor tend to not lie as easy when OSHA is asking the questions as there are consequences far above what the company can hand down.
Bryan
