The law for institutions serving adolescents with mental and behavioral problems received final approval from the legislature in March, nearly a month after Hilton gave emotional testimony to support its enactment. Governor Spencer Cox approved the initiative last month, but had a ceremonial signing with Hilton on Tuesday.
The new law will require greater government oversight for treatment inmates and documentation when controls are used on youth. It will also prohibit the use of sedatives or mechanical controls without prior authorization.
Hilton testified that she suffered psychological and physical abuse at a Utah boarding school, where she said staff beat her, forced her to take unfamiliar pills, watched her shower, and referred her to solitary confinement naked as punishment.
The celebrity and reality star also spoke about the abuse in the documentary "This is Paris" released late last year.
Since the documentary premiered, other celebrities have spoken about their experiences at that school or others like it, including Michael Jackson's daughter Paris Jackson and tattoo artist Kat Von D.