Pete Aitken, father of 22-year-old Hannah Aitken, is advocating for tighter restrictions on the sale of a lethal industrial chemical linked to his daughter’s suicide. Hannah, who struggled with autism and mental health issues, purchased the poison online without restrictions. The case has raised concerns over the lack of regulations on similar substances and prompted discussions on potential policy changes. The Surrey coroner emphasized the need for better oversight to prevent future tragedies. Aitken is calling for the substance to be classified as a regulated poison, requiring a license for purchase.