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Mexican immigrants more likely to remain behind bars after arrest, data shows

Migrants from Mexico and Guatemala are apprehended by U.S. Border Patrol agents after crossing a section of border wall into the U.S. on January 04, 2025 in Ruby, Arizona. Unlawful border crossings along the Texas Southern border have plummeted to a four-year low according to recent data provided by U.S. Customs and Border Protection. Immigration experts have attributed parts of the decrease to a ruling under the Biden administration. The ruling encouraged traveling migrants to make appointments through an app before turning themselves in at ports of entry. The ruling also established ineligibility for asylum seekers attempting to cross illegally. President-elect Donald Trump continues speaking on and proposing hardline border and migration policies at the U.S.-Mexico border upon his return to office on January 20. (Photo by Brandon Bell/Getty Images)

SAN DIEGO (Border Report) — Mexican nationals are more likely to be detained after being apprehended by federal immigration officers, according to data compiled by Transactional Records Access Clearinghouse.

TRAC figures show that in July, 57 percent of Mexican nationals arrested for crossing the border or for being in the country illegally were held in detention centers while their proceedings take place in immigration court.


By contrast, overall, only 30 percent of migrants were detained after their apprehensions.

TRAC chart detailing in ICE what percentage of migrants are held custody according to nationality. (Courtesy: TRAC/Syracuse University)

According to TRAC, ICE determines when a person is held, and that there is no specific pattern in the decision-making.

“In reality, little is known about the factors that influence these custody decisions,” writes TRAC. “The ICE agents have wide discretion to make decisions and their criteria is rarely revealed.”

According to TRAC, it appears decisions are taken by the agents themselves and are influenced by their own backgrounds and ethnic identity.

However, the state in which migrants are apprehended can also determine whether they are detained.

TRAC says being detained can have major implications, adding that individuals who remain in custody have a more difficult time obtaining the documents and the legal help to make a case against deportation.

TRAC also says that the vast majority of individuals in ICE custody, through June 30, had no criminal record, and that 4 out of 5, either had no record or had only committed a minor offense such as a traffic violation.