The courts have consistently ruled that the Fourth Amendment does not shield people from routine, non-invasive procedures that are more administrative than constituting a search - such as fingerprinting....or, in this case, swabbing the inside of the cheek with a sterile Q-tip.
This is no more invasive than fingerprinting
The courts have consistently ruled that the Fourth Amendment does not shield people from routine, non-invasive procedures that are more administrative than constituting a search - such as fingerprinting....or, in this case, swabbing the inside of the cheek with a sterile Q-tip.