Will this person be barred from entering Canada (even with a valid passport) having been charged, but not convicted of a DUI?

A dui, even just arrest, might result in canada stopping entry.

What do I say to the FBI and in my statement inorder to get my wife cleared of this felony?Will have to claim the drugs are mine

You should not be speaking with law enforcement if you want to help your wife. Get her an attorney and work with him if your want to help her.

What can I do to prevent this I don't feel I owe her

You could always call the cops on her. She might also make a report against you though.

Shooting someone who is robbing you.

If you're talking about a civil case for damages then it would depend on how likely the law suit would get a judgment. If you use excessive force...

Should I contest this traffic citation?

I don't think you understand what evidence is. Testimony is evidence. If the officer testifies that he saw you fail to move over and that you did...

I need help with a charge of shoplifting that i did not do but it looks like i was going to, i cant have another thing on me

You need to get an attorney. If you can't afford one, ask the court to appoint one. But you absolutely need an attorney.

72 time limit on parking tickets violate due process?

I have never heard of a 72 hour rule, but it is common for towns to enter guilty pleas in traffic matters if the driver fails to answer the ticket....

Should I pay my civil demand to avoid any further criminal charges?

Paying or not paying will not affect if criminal charges are brought. Consider yourself lucky the police were not called and learn from this...

Yes if a warrant is issued it could toll your time. Avoid drugs and you won't have a problem

Is there anything that i can do to be compensated for sitting in jail for all of that time?

You can speak with a civil rights attorney to see if you have a case. Be aware that the fact that your case was dismissed does not automatically...