How Can you Tell & Prove someones using speed mod?

[A51 Shipper]

You engage another player, they try to run but your facing the wrong way. So you hit cruise as well but suddenly they go from 5k out to 8k in a second then dissapear. May be lag, may be a mod?

How can you tell if someone is using a speed mod or a cruise speed mod? How can you be sure? If you are sure how can you record such an event???

People who have played online for years get that gutt feel when things seem a little odd. Any ideas?

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Tallyho Good Chappie! Stiff Upper Lip What?! Now, where are my pants!