Earlier quoted context omitted.
And neither equal "guilty until proven innocent".
Isn't it an underlying principle? It's meant to prevent detainment without proof of guilt. Otherwise, people could be held indefinitely for no reason. Now obviously there is a gray area between "hey we can't hold on to anyone until the courts say so" and "I don't like the look of that guy, lets put him in jail." But I don't think it's unfair to argue that handcuffing and pointing a weapon at someone who has not posed…
There are definite restrictions on that—however, they're after a few days in jail, not after 10 minutes in cuffs.