A Dorchester driving instructor was formally charged on Wednesday - and immediately agreed to plead guilty - to bribery to obtain driver's licenses for three of his students even though they hadn't taken the required driving test first.

Ngan Dinh, 48, was formally charged in an "information" in US District Court in Boston with conspiracy to commit honest services mail fraud. The charge carries a maximum sentence of 20 years, but the US Attorney's office agreed to ask for a far shorter sentence in exchange for Dinh's plea.

According to the federal filing, Dinh conspired with a road test examiner at the RMV office in Brockton between August, 2020 and April, 2021. Three students paid Dinh a total of $3,330 for him certifying they had taken and passed road tests they did not actually take. Dinh then paid the RMV worker a total of $300 to accept their learner's permits and grant them Class D driving licenses.

The filing does not mention whether the RMV employee was also charged, but states that Dinh conspired with "the Co-Conspirator and others known and unknown to the United States Attorney."