For people glad that "crimes will be solved", must be noted that criminals could use it in their benefit also. Just submitting a strange DNA, from a deceased people for example, to be linked with their name. That would taint the database, make they invisible to computers searching (dead people don't commit crimes) and send the hounds far away eventually. If caught you can always blame the lab for mixing your data.

Looks like the modern equivalent to having a new identity after a fake new ID card.