Serial rapist caught by French police, but unable to tell which because of twins' DNA

[Lukin]

In normal DNA analysis, 400 base pairs would be compared.

In this twin DNA analysis case, billions of comparisons would have to be used...

http://www.telegraph.co.uk/news/worldnews/europe/france/9861164/Double-trouble-for-Marseille-police-hunting-serial-rapist-as-DNA-turns-up-identical-twins.html