The present invention includes a method of detecting contamination in a fluid sample includes bringing a fluid sample into contact with a pair of spaced apart electrodes and applying a plurality of voltages across the electrodes, wherein {HEAD ~ the plurality} of voltages vary in {TAIL ~ magnitude} between a first and second voltage level 
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The present invention includes a method of detecting contamination in a fluid sample includes bringing a fluid sample into contact with a pair of spaced apart electrodes and applying a plurality of voltages across the electrodes , wherein { HEAD ~ the plurality } of voltages vary in { TAIL ~ magnitude } between a first and second voltage level
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