Golly, you people are so much more security savvy than I am. I'd be dead impressed with myself if I was using fingerprints for stuff. I suppose fingers can be cut off and retinas gouged out. I'll be waiting for a scanner that reads my eternal soul. Until then passwords do the job.
We had a company doing a demo with one of the scanners and they have done independent test with fingers from dead people and it did not work. It has something to do with the electric current or energy that are within a living finger. He says not all devices have this feature, but their technology did.
So your cheaper brand scanners might be fooled by a finger being cut off or a eye being gouged out. ^grrrrr^