To allow DAII's to use a highspeed handpiece is a horrible idea.  Dentist train for years to gain the skill to use a high speed on patients.  We train on plastic and extracted teeth for two years prior to clinical care, and then only use a handpiece with a rubber dam in place, which gives the patient's some protection.  I strongly oppose this and agree with others who have stated how this belittles the training dentists endure to be able to do their work successfully and not harm their patients.