Is the piece of rock you're showing me shaped like a knife, or an awl? If it's shaped like an awl, as you say, then let's stay on topic and not go chasing red herrings. The function of an arrowhead also dictates that it must have a design the allows it to be bound to the end of a wooden shaft, and be small and light enough to be propelled by the bow. If it's a knife, it still fails.
Now maybe you are beginning to understand what I'm getting at. Even determining the functionality requires testing the physical parameters.
So in this case functionality is not a valid test. It is superfluous. Remember the purpose of this exercise is to determine a test or tests adequate to test my hypothesis. I think you can realize that it is best to actually look at the rock before you decide exactly what tests to perform. When I picked up the rock it was sufficient to convince me that it was an arrowhead or at least deserved some attention. In order to convince you the tests have to be determined after the hypothesis. As I stated, dried blood does not have the functionality of blood in the veins. It is still blood.