Physician, Heal Thy Robot: Medical schools are turning to robotic simulators as a replacement for real patients. Students can practice everything from life support to drawing blood on them:

Immersion's widely used CathSim, which combines computer images with an 'arm' to insert the needle, makes students go through all the steps of a blood draw, from confirming a patient's identity to pushing the needle in the until they feel the 'pop' as it enters a vein.

I suppose that's better than learning to draw blood on each other, which is what we had to do in med school.