Joe, here is a little mention of the tomato test you speak of. Doesn't sound so great here.
"The unacceptably wide range of rat starting weights (±18% to ±23%) invalidated these findings.
No histology on the intestines was done even though stomach sections showed mild/moderate erosive/necrotic lesions in up to seven out of twenty female rats but none in the controls. However, these were considered to be of no importance, although in humans they could lead to life-endangering hemorrhage, particularly in the elderly who use aspirin to prevent thrombosis.
Seven out of forty rats on GM tomatoes died within two weeks for unstated reasons.
These studies were poorly designed and therefore the conclusion that FLAVR SAVRTM tomatoes were safe does not rest on good science, questioning the validity of the FDA's decision that no toxicological testing of other GM foods will in future be required."
The whole story can be found here.
http://www.actionbioscience.org/biotech/pusztai.html