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There are many documented cases of meteorites being reported as from Mars.

While I can understand that it's possible to know if a rock originated as a meteorite. What I don't understand is how scientists can say it came from Mars with certainty.

How can they verify such a claim, and differentiate between a rock that is similar to one from Mars to one that really is from Mars.

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perhaps they check out the areas in which Meteor Showers were seen,then by chemical compositions they can ensure that the rocks are from mars may be. – Praveen Kadambari May 6 '14 at 3:19
As a sidenote, if you go to the Smithsonian Museum of Natural History in Washington, D.C., you can actually touch a fragment of a meteorite believed to be from Mars. – Joshua Oct 21 '14 at 14:17
up vote 5 down vote accepted

Mars is the only planet providing rocks with a similar chemical composition and age. So the origin of the meteorite is evident.

This doesn't mean, that it's absolutely waterproof. There might have existed protoplanets similar to Mars 4 billion years ago, which since then have been swallowed by Jupiter, the Sun, or have been ejected out of the solar system. But this would be much of coincidence without leaving convincing evidence. (Here a paper about a couple of simulations.)

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