US law enforcement served a modified search warrant that allowed agents to collect thumbprints and fingerprints of everyone at the premises. The warrant is not publicly available at this time but a court filing dated 9 May 2016 provides some insight into the lengths to which the Department of Justice was willing to go to investigate a property in Lancaster, California. The document reads: “The government submits this supplemental authority in support of its application for a search warrant which seeks authorization to depress the fingerprints and thumbprints of every person who is located at the SUBJECT PREMISES””]
Source: https://grahamcluley.com/cops-served-warrant-collect-everyones-thumbprints-property/