A fish by any other name, still smells as icky

Is that really super tuna that they are serving you? Some students recently used DNA testing to determine how often sushi-grade meat was actually the type of fish advertised. They found that one in four samples was mislabeled! The technique that they used is called genetic fingerprinting. This involves amplifying particular segments of the genomic DNA with PCR, and then comparing the relative size of the reaction products. This is similar to the DNA tests used to determine paternity. More rigorous tests are used for criminal evidence, but the principle is the same.
Of particular interest, is that in every case a lower-quality of fish was mislabeled; leading people to believe that they were eating the expensive dish that they ordered. This type of testing is being extended to other food products as they transported around the world in bulk. Other targets for DNA finger printing include prisoners, soldiers, pets, and recently, children.