DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Gloved hand pipettes urine onto a test device to detect Cotinine (a bi-product of Nicotine) to determine whether a patient has been smoking. See images 1 and 3 in which urine is pipetted from a sample tube and then the test device produces a negative test.
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