Correct me if I'm wrong but I assume that you mean throwing them over the step to the other alliance's side of the field to take out their tote stacks.
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With the exception of UNPROCESSED LITTER, if the actions of one ALLIANCE cause any of the other ALLIANCE’S game elements that are in scoring position to no longer be in scoring position, the affected ALLIANCE will be credited points for the displaced game elements at the conclusion of the MATCH.
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This is from 3.1.2 of the manual. Knocking over the other alliance's totes would not help you because they would get the points anyway.
I read the entire game manual for this year's game for the rules test my team issues for driving.
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G1 ROBOTS whose operation or design is dangerous or unsafe are not permitted.
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This is in section 3.2.1 of the manual. It doesn't say no throwing totes but I'd bet that it would be considered unsafe.
So basically, don't throw totes.

The Manual:
http://www.usfirst.org/sites/default...Manual0123.pdf