If you're shooting a university's graduation, then odds are that most of the people in attendance are from out of town and plan to leave soon. In addition to the camera, tripod and flash, you should also have a great photo printer so that you can deliver the goods on the same day.
Polymerase chain reaction. Polymerase chain reaction, (PCR), a technique used to make numerous copies of a specific segment of DNA quickly and accurately.
PCR is the amplification of a small amount of DNA into a larger amount. It is quick, easy, and automated. Larger amounts of DNA mean more accurate and reliable results for your later techniques. PCR can be used to create a DNA fingerprint, which is unique to each individual.