Indicted last May, Rock was accused of making two traffic stops on June 7, 2008, and securing cash in lieu of issuing a traffic citation.
That action constituted depriving the individuals of their constitutional rights against unreasonable search and seizure.
Rock, 35, admitted his actions to the court and faces up to one year in prison and $100,000 fine for each offense.
The government did not make a recommendation about his sentencing.
U.S. District Judge Sharion Aycock presided over the 22-minute hearing.
Rock was represented by Pontotoc attorney Brad Cornelison.
Aycock will not set a sentence date until completion of a report about Rock to guide her decision. It often takes several months for such a report.
She may order him to pay restitution.
Rock remains free on bond.
• Read Wednesday's Daily Journal for more details.