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The biometric tests either look at patterns in your iris or retina. The contact lens, as long as it was transparent would just alter the focussing required to see the iris, not the patterns within it so probably not. If you drew someone else's iris patterns on your contact lens I am not so sure.
If by fooled you mean unable to take an accurate reading - then the answer is yes.
There are always people for whom biometric ID won't work. They are referred to as 'Mules' - New Scientist article some while ago.If your work is so tough that it smooths out your fingerprints, if you have no eyes or you are an amputee your biometric data may not be usable.But, for most people, it could be useful.