Carjackers swipe biometric Merc, plus owner's finger
theregister.com(2005) Original source: http://news.bbc.co.uk/2/hi/asia-pacific/4396831.stm (https://news.ycombinator.com/item?id=6362752)
old news but, a potential problem.
even if other factors are used to defeat a [$5 boxcutter] exploit, there is still the motivation to try, also the intimidation angle, of losing some parts as retribution for having biometric security, and hobbling your ability to use it again.