Consider the following:
https://en.wikipedia.org/wiki/Terry_stop
https://en.wikipedia.org/wiki/Civil_forfeiture_in_the_United...
http://theweek.com/articles/531458/troubling-rise-swat-teams
https://en.wikipedia.org/wiki/Contempt_of_cop
https://en.wikipedia.org/wiki/New_York_City_stop-and-frisk_p...
https://www.youtube.com/watch?v=rao33ZYlrq4 (just watch it and get infuriated)
https://en.wikipedia.org/wiki/Mass_surveillance_in_the_Unite...
Of course, understanding the motivation for their use, and oversight of the users is important, and I am in favour of making sure these tools are not abused. However to say that their mere existence implies a police state is laughable.