His name is jared campbell and his badge number is #8470. It’s not much, but you can report him for abuse of power at the seattle office of police accountability (email : opa@seattle.gov ). Here is a email template:

To Whomever it may concern in the Office of Police Accountability,

On the 30th of March, 2020, at a protest against police brutality in Seattle, a police officer used excessive force against a child. Officer Jared Campbell (Badge Number #8470) was recorded using mace against a child. This video has gone viral and is being spread on a variety of social media platforms. This an excessive use of force and an abuse of power, and this officer should be removed from his position. 

A concerned citizen, [Insert name]