Nominally this was a response to incidents throughout the rest of the state such as Columbine, but in reality the purpose was to try to combat youth gangs. In this respect I think it partially worked for the circumstances.
However, this was also used to target usage of marijuana and cigarettes by students. I'm not sure how effective this was, because data about that was not commonly released by the school. Needless to say, a lot of students didn't like this, but opinion of the student body was very divided. It would be interesting to see how things have changed in Colorado high schools since marijuana was legalized; I'll have to look into that, but in most schools marijuana is still banned (like tobacco products) so things could only get worse if school policy is unchanged.
It saddens me to read about solving youth problems by attacking the symptoms rather than the cause. Though I understand why, fixing the cause takes time, is unpopular to those on the political right, while fixing the symptom seems can achieve immediate results (though not long term).
To tackle the problem of gangs around school, there were a couple of important changes our last principal initiated, that other schools in the area did not necessarily pick up on. 1) Strictly enforce a ban on certain types of clothing that were being used to display allegiance to given gangs. 2) Increase the amount of open spaces for students to stay in while not in classes. 3) Require that students show up to school each morning, even if they do not have classes that morning. 4)Encourage students to stay inside during school hours, even when they have off blocks. 5) Have police/security officers at school introduce themselves to students, and engage students in conversation to get to know them.
On the whole the principal was very engaging so it was thanks to these programs that the gang problem was not as bad when I left compared to when I entered. In this case the heightened role of security was leveraged to have some positive effects, something not seen at other schools where there is a fundamental lack of trust between students and security. Trust and positive engagement are key, but achieving that is difficult.
s/most/all
and that won't change any time soon