When the body of teenage boy Dario Cicolecchia body was found in a Swiss cornfield, sexual abuse was first considered. When swab samples from the boy's body were analysed, investigators found microscopic one-cell organisms called diatoms. A diatom is only found in water, so police began collecting samples from different bodies of water. Analysis of diatoms from a nearby creek matched those found on the boy's body and supplied police with the location of the murder. Months later, Roland Kubler was convicted of sexual assault and the attempted murder of another child, which brought him to the attention of investigators. Analysis of the Kubler's car led to a match of diatoms found on the Dario's body, which led to his arrest and conviction.