If you’re asking if criminals can/do own cops, yes, it happens. Look at the current state of the US or certain areas in Mexico. I only mention these two countries because I don’t know enough about other countries to make direct statements, but I am certain it happens. But it’s not like at a low level cop, it’s more likely the actual sheriffs or DAs or people in power. Those that have the power to let the criminals go.

In terms of low level cops taking bribes in general, and again I only mention Mexico from experience, but it is very common. Common enough that there’s a name for it (mordida), and that they’ll threaten regular folks who have maybe minor infractions to get some cash. (acab and all)