At least 46 people have overdosed at or near a park that runs alongside Yale University from a suspected bad batch of K2 synthetic cannabis, authorities have said.
"The man was arrested within the last hour by members of the NHPD Intelligence Unit", police said in a release.
The Town of Hamden wants to remind people who use any street drugs can, and may, result in death or serious medical complications.
Officials said three people have been arrested in connection with the overdoses, including a man who may have been giving out free samples of K2.
Three arrests have been made in the case, Hartman said, but officials can not say for certain if all three arrested or just one of them are directly responsible for the overdoses.
Some of the people were unconscious - others were vomiting or exhibiting other overdose symptoms.
"With the exception of one patient, thus far, the illnesses are largely not life-threatening and concentrated to a portion of the New Haven green", Hartman said.
The mass overdose began Tuesday night and forced police to continue monitoring the Green late into Wednesday night.
Dr. Kathryn Hawk, an Emergency Department physician at Yale New Haven Hospital, told the New Haven Register that the Drug Enforcement Administration confirmed the drugs contained K2 mixed with fentanyl, a synthetic opioid that's roughly 50 times more potent than heroin.
The slew of overdoses comes as the Centers for Disease Control (CDC) published a preliminary report on Wednesday on the record number of American drug deaths.
"People are self-medicating for several different reasons and every agency - police, fire, medical, hospitals - all are strained at this time", Chief Alston said. Fire and emergency crews responded to an area right across from City Hall.
"The substance behind these overdoses is highly risky and must be avoided", Malloy said, adding that state public health officials had delivered 50 doses of Naloxone to New Haven to replenish the supply expended by first responders over the course of the 24-hour crisis. 'Narcan was not effective here at the scene, ' said Alston.
The overdoses follow a similar outbreak at the same park on July 4, when more than a dozen people were treated.
New Haven emergency personnel respond to overdose cases on the New Haven Green in Conn.on August 15, 2018.