MLB Trade Deadline Question:
 

Alright Baseball Eggheads (meant as a compliment), please explain this to me:

The Astros traded a minor league LHP to Arizona for Oliver Perez...

The swap came a week after baseball's deadline for trading players without placing them on waivers

-I thought that could not happen.
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Not sure, but my guess is that since the player in question was in the minors, the waiver rule didn't apply.