There are various ways to measure where a nation sits on the police-state axis.
One way is to compare what you see in America with the following standard description of a police state. A police state maintains its control through the pervasive surveillance of peaceful citizenry, through a vast number of laws with draconian enforcement, and by converting rights into privileges that can be withheld – for example, the ability to travel. Typically, there is a special police force, such as a Stasi, that operates with no transparency and few restraints. The special police do not address violent crime; instead, they exert social control and enforce the law whatever the law may be.