If it had cause for concern about the age of any user - whether it thought they might be older or younger than claimed - it said it would suspend the suspect account and only reactivate it after seeing official government identification.
Some federal sources said it was even too early to say investigators had identified the suspect, but several sources in Boston told CNN that they have a clear identification.
The samples may not be processed without suspects' consent until they are arraigned, must be destroyed if charges are dismissed or the suspect is acquitted, pardoned or has a conviction reversed on appeal, and can only be used for "identification" purposes.