Ex-Cedar Hill Officer Convicted of Abusing Detainee Gets 300 Days Behind Bars

A Badge Used as a Weapon

Former Cedar Hill police officer Donald Najee Mercer was sentenced to 300 days in jail after a jury convicted him of official oppression stemming from a 2024 traffic stop. The case, which unfolded in Ellis County, exposed a disturbing pattern of a uniformed officer exploiting one of the most vulnerable moments a person can face — sitting in handcuffs in the back of a police cruiser.

Mercer had pulled over a 27-year-old woman, performed a field sobriety test, and then placed her in handcuffs in the backseat of his patrol car. Prosecutors revealed that Mercer kissed the arrested woman, deactivated his body camera, and asked her for oral sex after hiding her possession of marijuana. Rather than doing his job, he leveraged his authority — and her legal vulnerability — for his own gratification.

Covering His Tracks

Evidence presented at trial showed that after returning to the patrol vehicle, the woman told Mercer she had marijuana in her pocket. Prosecutors said Mercer removed the marijuana but did not enter it into evidence or mention it in his police report. He later told the woman the marijuana had been "disposed of," according to court testimony. The concealment wasn't accidental — it was calculated. By burying the drug evidence, Mercer created a secret the victim might feel too afraid to expose.

Investigators allege Mercer later pulled over and turned off all his vehicle's lights and his body camera. That deliberate act — disabling the one tool designed to keep officers accountable — speaks volumes about his state of mind. He knew exactly what he was doing and took active steps to ensure no one would see it.

A Pattern, Not an Incident

During sentencing, jurors heard testimony from at least two other women alleging similar misconduct by Mercer during traffic stops, including one who said he groped her. What prosecutors presented was not the story of one catastrophic lapse in judgment, but a repeated, predatory pattern of behavior toward women who were already in his custody and control.

Mercer had resigned from the Cedar Hill Police Department after the city received a complaint related to the woman's arrest in August, resigning "rather than face termination proceedings," police said. An internal investigation had already sustained four policy violations against Mercer, ranging from dereliction of duty to conduct unbecoming an officer. The department, to its credit, did not let the resignation close the book on the matter.

Justice Delivered — and Its Limits

Mercer was sentenced to 300 days in the Ellis County Jail after a jury convicted him on June 10 of a misdemeanor offense, and was ordered to serve jail time after jurors rejected probation. The rejection of probation was a meaningful signal. Jurors heard the full scope of his conduct and decided that community supervision simply wasn't enough.

The conviction is a rare but important outcome in cases of law enforcement misconduct. Official oppression — a Class A misdemeanor in Texas — carries relatively modest maximum penalties compared to the gravity of the abuse involved. That gap between what the law allows and what victims experience is a conversation Texas, and the country, continues to grapple with. Cedar Hill's Police Chief Ely Reyes emphasized a culture of accountability, saying, "We empower our people to report misconduct when they see it and that is exactly what happened in this case." Whether that culture holds — and whether other departments follow suit — will matter far more than any single verdict.