The cases were dismissed yesterday, he said, following Suu Kyi's announcement the day before that she was working with her new civilian-led administration to secure the release of scores of political prisoners languishing in Myanmar's jails.
"Police have dropped 199 cases against political activists around the country as of yesterday," the officer told AFP on condition of anonymity.
The issue has personal resonance for Suu Kyi and many in her fledgling government, which is stacked with former activists once jailed under junta rule for their pro-democracy campaigns.
In statement later that night Suu Kyi said more political prisoners would be released following Myanmar's new year holiday, but that "necessary scrutinisation" would need to be completed first.
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The police officer told AFP more cases would be reviewed during the festival, which starts next week, and that other activists could be freed when the courts reopen.
Suu Kyi's administration is expected to seek the release of convicted political prisoners through a pardon signed by President Htin Kyaw, a close aide of hers who was sworn in last month.
Yesterday's release of activists was applauded by international human rights groups, though many urged the new government to go a step further and amend legislation that allows authorities to round up peaceful protesters.
"We look forward to the release of all remaining political prisoners and their full rehabilitation," the European Union said in a statement.
Watchdog groups in Myanmar say there are still hundreds of activists facing trial or being held in the country's notorious prisons, many of them arrested under the quasi-civilian government that stepped down last month after five years of transitioning the country from junta rule.