Any drug that has been in your blood stream gets absorbed by the hair follicles in your scalp. As your hair grows out of these follicles, the hair strands also pick up traces of these drugs. The lab analyzes the shaft of the strand of hair for any drug metabolites present.
Bay Area airports prep for private jets in for Super Bowl 50 at Levi's Stadium. The Bay Area's airports are preparing for an influx of private jets for Super Bowl 50.
Weather forecast for Super Bowl 2017: Roof closed for Patriots vs. Falcons. All week we wondered if weather would be a factor in the Super Bowl. HOUSTON -- Sunday's Super Bowl is being played in a stadium with a retractable roof, so weather could have been a factor when the Patriots and Falcons met in Houston. But the NFL has decided to take the risk out of it and leave the roof closed during Super Bowl LI, thanks in large part to concerns about showers later in the evening. More Super Bowl How to watch it