Chief Superintendent Stuart Bell from Met Police warned people against buying cannabis sweets.
"Please do not buy or consume these products. They are illegal and, because of the child-friendly packaging, they can pose a risk of accidental consumption."
The particular batch of gummies consumed were known as "Trlli Peachie O's".
"Drug dealers harm communities and risk the safety of individuals. We will take positive action to target those engaged in this activity as well as those found in possession of these substances."
In New Zealand, it's illegal to possess any synthetic cannabis, party pills or herbal highs – what the law calls "psychoactive substances".
In 2018, over a 12-month period, 45 people in New Zealand died from fatal overdoses from synthetic cannabis.