Judy McKim painted the words "Autistic Man Lives Here Cops No Excuse" on her garage door in Henderson, Nevada (video below).
"This is a little hidden house, and no one knew what was happening in this house," McKim, who has dozens of other signs to alert the police, told KTVN.
"I made sure that they knew everything," McKim added. "[He's] still in diapers. Doesn't understand words. Doesn't understand what a gun is."
According to McKim, a friend called the police because her severely autistic 28-year-old son Zachary was experiencing an emotional rage.
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McKim recalled that the officers came to her home and attempted to restrain her son.
"He is in a diaper, along with the pacifier, and the cops are kneeling on my son and one of them reaches for his gun because Zach was fighting for his life," McKim recalled.
"He's autistic, he doesn't know what is happening," McKim added. "He doesn't know what police is."
The police report never mentioned the cops touching Zachary, noted KTNV, even though he was transported to a local hospital where he was confined for two days; no charges were filed.
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"I had to do this for my son's safety," McKim told the news station. "I had to do this so that everybody knows now. Everybody in the neighborhood going by, they know why there's weird noises, loud music."
"I don't like doing that," McKim added. "I'm embarrassed. I'm embarrassed that everyone knows. I'm embarrassed that I'm on TV. I'm embarrassed that you guys are seeing my life, but that's the reality."
Henderson police say they've contacted McKim about the incident, but it's unclear if they have formally acknowledged her message about her son.
A study released by the Office Of Research & Public Affairs in December 2015 provides insight into mental illness and fatal law enforcement encounters:
By all accounts -- official and unofficial -- a minimum of 1 in 4 fatal police encounters ends the life of an individual with severe mental illness. At this rate, the risk of being killed during a police incident is 16 times greater for individuals with untreated mental illness than for other civilians approached or stopped by officers.
Where official government data regarding police shootings and mental illness have been analyzed -- in one U.S. city and several other Western countries -- the findings indicate that mental health disorders are a factor in as many as 1 in 2 fatal law enforcement encounters.