If you file a lawsuit, you can use subpoenas and the civil discovery process to obtain evidence. CR 26 - 37 and 45.

Advice for suing prior landlord?

Maybe the Tenants Union can give you some guidance about the particulars of your case. https://tenantsunion.org/en See also RCW...

See https://app.leg.wa.gov/RCW/default.aspx?cite=4.16

Can you sue a ER doctor for lying on paper?

It is very possible that you have a cause of action at civil law. See https://app.leg.wa.gov/RCW/default.aspx?cite=7.70

What should i do?

You may have a cause of action at civil law. See https://app.leg.wa.gov/RCW/default.aspx?cite=7.70

Can I sue a local sheriffs department for negligence and child endangerment

See Donaldson v. Seattle, 65 Wn. App. 661, 831 P.2d 1098 (1992).

What are my legal rights as a victim of a car accident?

Call an attorney. If the driver had sufficient insurance, it should pay for all the medical expenses, incidental expenses, pain, suffering,...

I am trying to find the Government building location in Bellingham WA to apply for citizenship for my children?

See https://www.uscis.gov/us-citizenship/citizenship-through-naturalization/a-guide-naturalization

What can I do to protect my son when his father uses him to get out on bond while he has no custody or visitation?

A protection order might be your best bet. http://www.courts.wa.gov/forms/

Can I relinquish parental rights to my 17 1/2 year old who is dangerous to myself and 14 year old daughter?

If you have a reasonable fear of imminent bodily harm, you can call the police.