Is there a test for my litter of 8 week old puppies that would tell me which ones can be drug dogs?

All I can offer is the different puppy tests on my web site - they are very good. But there is no test and I do not believe that there can be a test that can identify a drug dog at 8 weeks of age - there is too much that goes into raising a dog that brings out the prey drive in a dog. Too many things can effect a dog’s temperament and drive during the first year of life that would result in a nice dog being screwed up. So this issue is not as simple as you would like it to be.

Dogs are born with a genetic level of drive. But the dogs don't naturally display this level of drive without training. I just finished a new training video titled Building Drive, Focus and Grip. This video explains how dogs can be brought up to the genetic level of prey drive.