First, I think a drug test must be given within a certain time frame. Second, a injury report should be written,a paper trail, in case of future problems. Also, does this employer have a safety program? Has he or someone trained or shown proper set up procedures? It's is not your fault,he's libel, bottom line. Now if he has a training program, he's still responsible for bills related. To collect on workers comp,I think you have to be out a certain amount of time,week or two? Protect yourself, see how he reacts to a injury report,if negative,well document it, document everything,buy a cheap log book, where pages can't be removed or replaced. Months from now or even a year from now,you could tweak that old spot, worse, he will say I know nothing. Does he even have workmans comp? That's bullshit, rate goes up, based on how many employees and job hazards etc. Paper trail is needed. Protect your self, he's probably worried, with no safety program,belts proper shoes, etc. Write a injury report and make a copy and give it to him, now!