[1][2] In 2021 he resigned from the FNSP and his academic position after being accused of the sexual abuse of a minor.

In mid-April 2021, French media, citing sources close to the investigation, reported that Duhamel had admitted to sexually abusing his stepson.

[7] In January 2021, he was accused by his stepdaughter Camille Kouchner in a book titled La Familia Grande of sexually abusing her twin brother, Duhamel's stepson, when he was 13 in 1988: this offence is outside the statute of limitation for criminal charges.

[4][11] Saying “Being the subject of personal attacks, and eager to protect the institutions I work for, I resign from [all of my positions].

[12] In mid-April 2021, French media, citing sources close to the investigation, reported that Duhamel had admitted to sexually abusing his stepson.