Mr Carroll said his bag had been drenched about twice a week in January this year while hanging outside his office. By February, he claimed it was happening almost every day.
“It was torment,” he said.
Suspecting Ms Morrissey was behind the campaign, he set up a inch-long spy camera on his winter coat and concealed it behind a scarf to catch the culprit.
On two occasions in April, it captured the 67-year-old politician pouring a glass of water into his green tote bag.
“In the very first video you’ll see Mary come out and it’s that helmet hair, white hair, that’s unmistakeable,” Mr Carroll said.
“You don’t actually see her face but that hair – nobody else in the statehouse has hair like that.”
Morrissey ‘elbowed me and told people I smell’
Mr Carroll claimed Ms Morrissey had repeatedly bullied him over the years, and elbowed into him just minutes after he was sworn in as a representative.
“Her favourite was… she would say in front of other legislators, she’d sniff loudly and say ‘What is that smell?’ and recoil from me,” Mr Carroll, who suffers from neuropathy, said. “It made me feel like s—.”
Ms Morrissey, who has been a Vermont representative since 1997, said she was “truly ashamed” for drenching her colleague’s bag in Vermont’s general assembly on Monday.
“It was conduct most unbecoming of my position as a representative and as a human being, and is not reflective of my 28 years of service and civility,” she told lawmakers.
Mr Carroll responded: “I’m going to be quite frank with you… for five months, I went through this. And each month, each day that I went through this, Representative Morrissey had a choice to make.”
Ms Morrissey also apologised to her colleague in a private meeting. Mr Carroll was unconvinced and told her: “Bulls—.”
“It’s just cruel to do it – to know that you’re inflicting pain on somebody else and you’re suffering,” he said.
“I told her there were days, weeks, that I walked around this place paranoid looking at my fellow legislators thinking, ‘Is it him? Is it her?’”
“I stopped going to the cafeteria… I didn’t want to feel that way toward my fellow legislators.”
A former colleague of both wrote in the Manchester Journal: “What the heck has gotten into Mary Morrissey?”
Ms Morrissey has been approached for comment by The Telegraph.