What happened to the 5th Amendment and not being forced to give testimony against yourself?
Under a line of Supreme Court cases going back more than 100 years, blood, saliva, hair, fingerprints, footprints, etc. are not considered "testimony." Taking any of these things is covered by the Fourth Amendment (unreasonable searches and seizures) not by the Fifth Amendment (self incrimination).
The Fed and most States have ruled that 5th amendment privilege does not apply to blood, breath, urine, DNA or even handwriting samples.