I am a lawyer and usually ask on listserve for recommendations of a process server in the target state. If I don't get a recommendation, I just...

I'm not sure where you are in the process, but if the time limits for amending as a matter of course have passed, see Federal Rule of Civil...

Unlawful stop DUI?

The stop is illegal if the officer lacked "reasonable suspicion" that you were engaged in in wrongdoing before he pulled you over (stopped you)....

Opposing party filed a document that is supposedly from my mother, but the writing style is not the same and it is not signed.

Generally, this is an evidence issue known as "authentication." You should tell court you challenge the authenticity of this declaration and that...

Evidence presented with appeal.

The question is somewhat unclear, but no evidence can be added after final judgment in the court from which you're appealing.