I think you ultimately must choose to rely on your own perceptions, otherwise it could become quite difficult to "pick and choose" which ones you trust and which ones you don't.
If your unsure if a gallon of milk has gone bad and don't trust your sense of smell that much at all, you may use your eyes to visually verify and even ask a friend to use his/her sense of smell to additionally verify. These 2 verifications go toward you're overall perception. Even if in the end you decide that you "don't know" and throw away the milk to be cautious you're trusting that your perceptions have brought you to a safe conclusion.
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Everything you think you thought, the water's gone...every drop. | 
remember "for mere impulse of appetite is slavery, while obedience to a law which we prescirbe to oursleves is liberty"-rousseau: the concept of the general will "if we can not reconcile all opions, then let us endeavour to unite all hearts."-?"to be is to be perceived"-? "‘We can be as honest as we are ignorant. If we are, when asked what is beyond the horizon of the known, we must say that we do not know’-Robert G. Ingersoll 
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