Not sure what regs apply over here; am in UK. It was at a private medical centre where I went to get my offshore medical done, the company who had just offered me a job paid extra to have them test me. I was a bit weirded out, but didn't think it was illegal, just odd. The last test I had (on my ship a few weeks ago) was more normal, there was only a temperature strip on the pots to 'stop' switching.