I'd be skeptical of courses like that. Science has repeatedly found no evidence of this being an ability that you can learn. There's an entire industry peddli

I'd be skeptical of courses like that. Science has repeatedly found no evidence of this being an ability that you can learn. There's an entire industry peddling pseudoscience around it but there's basically no evidence that it works. See this recent Skeptoid for a good summary: https://skeptoid.com/episodes/4836 https://skeptoid.com/episodes/4836 That episode quotes an opinion paper in Frontiers in Psychology, which I'll also do here: > Is the rational course simply to drop this line of research? ...We have now sufficient evidence that there are no specific non-verbal behavioral signals that accompany lying or deceitful behavior. We can safely recommend that courts disregard such behavioral signals when appraising the credibility of victims, witnesses, and suspected offenders. For psychology and law researchers it may be time to move on.