In a recent article there was a excerpt about a Luger pistol(for those unfamiliar with firearms, a Luger is an early semi-auto pistol made in Germany), which had a special attachment flashlight. The light is activated by gripping the pistol in your hand, the are two small brass contacts that the skin touches and completes the circuit. My question is in reference to using this type of switch to turn a small laser diode, embedded in a pistol grip, on and off.
The laser diode that i have in mind is 3v and 30ma, would this be safe to use in this type of system? How much voltage and/or current could a human tolerate without death or injury?
For those interested the pistol that was my inspiration may be found here: Extremely rare Luger 'Night Pistol' featured early tactical light - Guns.com.