Jaime Castro, a longtime officer who leads the Dallas Police Association, the city’s largest and oldest police union, was placed on administrative leave Friday while the department conducts an internal affairs investigation.

The exact nature of the investigation was unclear Monday. Responding to a list of questions from _The Dallas Morning News, _a police spokesperson said no further information would be provided to “protect the integrity of the process.”

“The Dallas Police Department expects every member of the organization to uphold the highest standards of integrity, professionalism and accountability,” Dallas police Chief Daniel Comeaux said in a statement through the spokesperson. “Any allegation of misconduct is taken seriously and investigated thoroughly and fairly.”

Castro did n

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