Criminals know how to defeat simple measures
Then clearly what we need are more complex measures:
* Higher resolution cameras for more accurate info
* Links between cameras so as someone moves out of sight of one the next one automatically picks them up and tracks them
* More cameras so that the dirty crims can't hide in an unobserved corner
* Gait recognition like this is aiming for so you can id someone without prints or a face
* Total removal of the right to privacy that the liberal terrorist sympathiser communists bleat on about all the time
While we're at it, what about
* compulsory ID cards so we can identify people when they are caught
* Tracking chips in your skull so we can do away with cameras all together
* Screens on every surface reminding us that it's for our protection.
</rant>
"It is easier to fight for principles than to live up to them." -- Alfred Adler