how do you check someone's Ban/Infraction History?

You can only check your own. I know Smods and admins can check pretty much anyone's.
Not sure how much Msquad, Gms and Clan Mods can see.

hmmmm ok... so basically only way i can get someone's checked is to ask a smod or admin?

Yea, but I doubt they are allowed to share any of that information with you considering all infractions/bans are supposed to be private. I would assume you are wanting to know from an applicant or what ever. The only thing you can really do is take their word that they're not lying about their infraction/ban history.

ok thanks mocro

The reason you can only see your own infractions, is because you only need to worry about your own infractions.

I can only see my most recent 5 infractions, how do I see them all?

Go to this page and you'll see a tab labeled "Infractions" yours aren't visible to me but you should be able to see them since it's your profile

It should be next to the friends tab

firstly that shows me some random persons profile.... secondly i wanted to know if i could find someone else's history, not my own

well you could see bans in the ban list if they are currently banned.