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