Also note, IIRC tattoos are forbidden in judaism (http://www.myjewishlearning.com/practices/Ethics/Our_Bodies/Adorning_the_Body/Tattoos.shtml http://www.myjewis

Also note, IIRC tattoos are forbidden in judaism (http://www.myjewishlearning.com/practices/Ethics/Our_Bodies/Adorning_the_Body/Tattoos.shtml http://www.myjewishlearning.com/practices/Ethics/Our_Bodies/...) and possibly other religions. (Although there's a halachic "out" for forbidden practices where the intention is to save lives, so this might be negotiable for medical emergency access to a pacemaker.)