A blood trail found outside of Nancy Guthrie’s house could be associated with a bloody nose, a bloodstain pattern analysis expert said. Pima County Sheriff Chris Nanos said during a news conference on ...

Drying droplets have fascinated scientists for decades. From water to coffee to paint, these everyday fluids leave behind intricate patterns as they evaporate. But blood is far more complex—a ...

In general, bloodstain pattern analysis (BPA) refers to the collection and subsequent forensic analysis investigation of the size, shape, and distribution patterns of bloodstains found at a crime ...

An FBI specialist says blood found outside the home of missing Arizona woman Nancy Guthrie suggests she was carried out of the Catalina Foothills property rather than leaving on her own, offering one ...