A legislative panel heard testimony for over seven hours Tuesday after an attempt to hold the hearing on July 22 was suspended when the Baker administration refused to make certain officials available to testify.
On Tuesday, registry officials acknowledged tens of thousands of such out-of-state notices have gone unprocessed for years.
"In the midst of all this, seven families experienced an unimaginable tragedy and they didn't deserve explanations or excuses," said Erin Devaney. "They deserved to have someone being accountable and acknowledge that the service that the registry of motor vehicles provided was unacceptable in this instance."
Registry officials have said an internal review triggered by the deadly crash has resulted in license suspensions for more than 1,600 Massachusetts drivers.
Zhukovskyy, 23, pleaded not guilty to negligent homicide in connection with the crash. The seven who died in the collision with a pickup truck were members of the Jarheads, a New England motorcycle club that includes Marines and their spouses.