Isotope analysis
A recent development in forensic science is the isotopic analysis of hair strands. Hair has a recognisable growth rate of 9-11mm per month or 15 cm per year. Human hair growth is primarily a function of diet, especially drinking water intake. The stable isotopic ratios of drinking water are a function of location, and the geology that the water percolates through. Sr, Sr and oxygen isotope variations are different all over the world. These differences in isotopic ratio are then biologically 'set' in our hair as it grows and it has therefore become possible to identify recent geographic histories by the analysis of hair strands. For example, it could be possible to identify whether a terrorist suspect had recently been to a particular location from hair analysis. This hair analysis is a non-invasive method which is becoming very popular in cases that DNA or other traditional means are bringing no answers.
Body Bags (film)
Richard Coberts is a middle-aged businessman who is very self-conscious about his thinning hair. This obsession has caused a rift between him and his long-suffering girlfriend Megan. Richard answers a television ad about a "miracle" hair transplant procedure, pays a visit to the office, and meets the shady Dr. Lock, who agrees to give Richard a solution to make his hair grow back. The next day, Richard wakes up and removes the bandage around his head, and is overjoyed to find that he has a full head of hair. But soon he becomes increasingly sick and fatigued, and finds his hair continuing to grow and, additionally, growing out of parts of his body, where hair does not normally grow. Trying to cut a hair off his mouth, he finds that it "screams", and, examining it under a magnifying glass, sees that it's alive and resembles a tiny serpent. He goes back to Dr. Lock for an explanation, but finds himself a prisoner as Dr. Lock explains that he and his entire staff are aliens from another planet, seeking out narcissistic human beings and planting seeds of "hair" to take over their bodies for consumption as part of their plan to spread their essence to Earth.