Wikipedia has a section on it's use in crime, but suggests that transdermal doses would be too small to be effective - ingesting it being the main attack method.
https://en.wikipedia.org/wiki/Scopolamine#Crime
what they do is let you get close and blow the powder in your face and that is enough. usually a distraction like they will get you to open a card and doing so it sprays the powder as you get close to inspect it. super scary.