The HPV test resulted in more false-positives than the Pap test, it is not widely available yet and it may not be covered by insurance.

CNN: Pap test challenged by HPV DNA test

Critics said the prospect of a no-hands T-Ray search raised general privacy concerns and fears over so-called false positives where an object on a person's body could be misread to be a weapon.

WSJ: Police Test New Scanner

And it produces a false positive fewer than three times in a million tries--compared with a hundred false positives in a million tries for an automated digital microscope on its own, the current, most accurate method.

FORBES: On The Cover/Top Stories

Because some legal substances -- such as fertilizers and heart medicines -- can result in "false positives, " Stanley said the ACLU also wants to ensure that people who test positive be treated respectfully.

CNN: STORY HIGHLIGHTS

Improve detection accuracy: Real-time calibration and simulations on large volumes of data minimize false positives.

FORBES: Fraud Prevention In A Big Data Environment

According to Sequella, early trials show that the patch picks up 98% of those infected, yields few false positives and is easier to use in the field than tuberculin-testing, since no needles are required.

ECONOMIST: A poor diagnosis

Says Dr. Jon Nakamoto, an endocrinologist and a lab director for Quest Diagnostics: "Society and the medical community have to make a choice: How often do we get these false positives and how often do we make a difference in the outcome"--that is, save a life.

FORBES: Magazine Article