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Originally Posted by Libertine
In many cases, it's impossible to completely prevent suffering. For example, when studying the course of cancer in rats (say, to see the differences in disease progression with different sorts of medication), it is impossible to keep them entirely sedated and on painkillers all the time - if only because painkillers could have side-effects which potentially affect the spread of the disease.
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I realize that. My point is that, while in the course of doing the necessary experiments, the animals can still be handled and treated in a humane manner. Cruelty doesn't have to enter into it.