Davis, Whyde, and Langton's federal study of contacts between the police and the public showed that, in 2015, roughly of all persons age 16 or older had some form of contact with the police.

53,5 million persons

Explanation:

In the 2015 report on Contact between the police and the public, an estimated 21% of  U.S. residents age 16 or older, about 53.5 million persons, had  experienced some type of contact  with the police during the prior  12 months.  

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