"Has this method, as disseminated by this company, ever been tested in a real incident?"

If so: "How did that go? Can you substantiate that it actually helped things?"

If not: "What reason does someone have to believe this will help? Is there any sort of real empirical backing or are you profiteering off of HR agendas and fearmongering? Do you accept any sort of liability if your method fails to help or even makes things worse? [Obviously not, so] Why should any of us have confidence in this to preserve our lives when you don't even have the confidence in it yourself to accept that liability? Is there any observable difference between your presentation and that of a reasonably competent snakeoil salesman?"