There' are no garauntees anywhere. Are you going to not take your car to the mechanic when it has problems? Doing it yourself or watching them every step of the way aren't always options. Sure taking it in is a risk but you are taking a risk by not bringing it in, or trying to fix the problem yourself and making things worse. There are ways to minimize your risk however; you consult others who have used the mechanic to get a more honest idea of his reputation.

Ultimately I think if hair tests were randomized often they wouldn't have a reputation for being useful. I really don't think this reputation developed out of thin air, or came out of some mass marketing campaign via the "hair analysis industry". Cutler, who you endorse, reccomends them. Others post positive outcomes, though I guess they could be spam bots for the labs. Like I said, nothing is 100%. 75$ seemed a reasonable risk at this point, given the research I've done. For others maybe it's not.