SAN DIEGO (Border Report) -- Mexican nationals are more likely to be detained after being apprehended by federal immigration officers, according to data compiled by the 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.

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 deci

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