MLB suspended Hector Santiago of the Mariners for a foreign substance on his glove. It turns out that was rosin.

Also, MLB did not investigate the glove:

Santiago later admitted he used rosin on his glove side, which is in violation of the foreign-substance rule. The glove was sent to New York, but sources said it wasn’t necessary to further inspect it, as the ejection and suspension are solely based on the umpires’ report of having detected a foreign substance.

ESPN.com

So if we see another ejection for the umpires finding something, we know a suspension is on the way.