The metropolitan police and other UK police forces will often try to arrest any black motorists, especially those driving expensive cars, for no good reason other than the colour of the driver's skin.
A motorist in Birmingam (England, not Alabama, but the attitudes are the same) was stopped for DWB ***35*** times in a year, and not once did he have as much as a faulty brake light. He did not break any speed limits and his car was in perfect order.
This is yet another example of the police being institutionally racist but nothing is ever done about it.
'You know what to do son, pull him over for 'driving erratically' and plant some drugs in the glove compartment'
In other words, when an officer arrests an African American for a completely bull reason because he/she is racist against African Americans.