Agreed, a reasonably designed 2W 2.4GHz radar in your car can detect both breathing and heartbeat. It couldn't tell the difference between a large dog and baby,

Agreed, a reasonably designed 2W 2.4GHz radar in your car can detect both breathing and heartbeat. It couldn't tell the difference between a large dog and baby, but maybe you should be dealing with it either way... Now I can see the car manufacturers don't want the liability for the a monitor failing to go off (false negative) due to any malfunction, when the number of false positives will be much higher. Thermometers and radars do fail, but humans will become dependent on them, and blame them and the manufacturers for anything that goes happens.