Bar Code Tattoo and Bar Code Rebellion by Suzanne Weyn

A law enforces that 17 year olds must get tattoos that contain their entire history(DNA, family, health, etc.). The world changes with this law and tattoos linked to Global-1 infuriate some and help others. Global-1 uses the tattoos to harm, herd, control, and pursue people. +Some friends turn into foes. Trust is almost completely useless with spies and lures lurking about. Clones find out more about themselves. I enjoy the part where KM-6 saves the day. I feel sorry for the clones, all six introduced in the book.