Speed hacks, or throttling thier connection to simulate extreme rubber banding to avoid getting shot.
Would be nice if they reset their Gen. and branded them for a week or two after "coming clean" as an ex-cheater. Seems the rate they are spitting out hacks, it is going to be hard to keep on top of. Branding them for a week or two will allow others to keep a watchful eye on them. As a person who hates hacks I think, breaking the EULA as they are, you would be well within your rights to ban their user name. Make them buy it again.