Sorry, I am more familiar with ASA. As already mentioned, ASA will test the bat. If it fails the test they will inspect it. Inspecting it may include cutting it open, xray, scanning micron xray, and other material inspection. If they find the bat was altered post manufacture, they will likely come back to you to invesitigate how the alterations came to be.
If they find that the bat is running hot, but see no signs of post manufacture altering they will likely share that data with the manufacturer and start to track that bat model looking for any trend. If they see a trend, then they will may take action, such as banning the bat.
As far as the vice hurting the bat. The tests are always performed at ASMT certified labratories. They have to prove that they have the staff, equipment and understanding to perform materials tests without damaging the material. Bat testing is primarily done at Washington State University in Pullman Washington. They have a great lab with great staff. The WSU staff involved have a very detailed knowldge of all of these materials and how they should be treated.
http://www.mme.wsu.edu/~ssl/