Do I have to give a breath or blood sample if I am pulled over? What if the officer gets a warrant?

Should I give a breath or a blood sample?

If my BAC is above a .08 am I automatically guilty of DWI?

If my BAC is below a .08 will my case be automatically dismissed?

Are breath and blood tests always accurate?

What if I only had prescription drugs in my system to which I was legally prescribed by my doctor?