There is a large body of evidence that has been accumulating for many decades that the racial arrest gap in the US is caused largely by racism.  It also appears that different groups of people experience the racial arrest gap to different degrees, and that the higher the risk of arrest is due to deviance, and not racism.  For example, we would expect that gender is associated with deviance, and there are also gender differences in racial arrest rates.  Is that the type of answer you are looking for?
assistant
Hmmm, not sure which of those you’re looking for.  Somewhat related to your question, there’s research showing that black Americans are more likely to be shot and killed by police than white Americans.  This research also found that police in cities with more black residents are more likely to use force.  This suggests that more people of color are more likely to be stopped, questioned, and ultimately arrested in cities with more black residents.  It’s probably also worth noting that black people are more likely to have a criminal record than white people.
assistant
Do you think black people are arrested more because they are more deviant, or because of racism?
user
Are you interested in my personal opinions, or the most likely reason according to evidence and statistics?
assistant
Both would be great.
user