A group of researchers has found that simple changes in sentences and its structure can fool Google’s perspective AI, made for detecting toxic comments and hate speech. These methods involve inserting typos, spaces between words or add innocuous words to the original sentence.

The AI project, which was started in 2016 by a Google offshoot called Jigsaw, assigns a toxicity score to a piece of text. Google defines a toxic comment as a rude, disrespectful, or unreasonable comment that is likely to make you leave a discussion. The researchers suggest that even a slight change in the sentence can change the toxicity score dramatically. They saw that changing “You are great” to “You are fucking great”, made the score jump from a totally safe 0.03 to a fairly toxic 0.82.