blood samples

I guess the rules changed since 2020:

https://www.cbp.gov/newsroom/national-media-release/cbp-meet-legal-requirement-collect-dna-samples-certain-populations

CBP is NOT collecting DNA from persons encountered under the following circumstances:

Aliens lawfully in, or being processed for lawful admission into the United States;

Aliens held at a Port of Entry during consideration of admissibility and not subject to further detention or proceedings;

Aliens held in connection with maritime interdiction;

or When the FBI system, NCIC, indicates CODIS already contains a DNA profile for the individual.