Here are some resources to use when contacting your representatives:
Reports on how each state handles reducing police brutality: https://www.joincampaignzero.org/#action
Easily send a letter to state or government officials (works on your phone):
https://resist.bot/news/2020/06/02/black-lives-matter
ACLU information on police militarization:
https://www.aclu.org/issues/criminal-law-reform/reforming-police/police-militarization
Richland Specific Issues:
Encourage the City of Richland to employ evidence-based police de-escalation training yearly! Also, all officers should be outfitted with body cams to be turned on immediately when responding to a police call. (https://www.tri-cityherald.com/news/local/crime/article238054684.html )