When I was using a different mod I think it was EmberXML's, I had to change the keywords to trace weapons to TRC, when you change it back to the default keywords the weapons are able to be searched. Maybe you should check for that via StopThePed.ini. If thats not the reason then Im not sure.
Also, I am having one slight issue, sometimes when I run into some potential narcotics, I am not able to test them because they may be written in plural form, such as "crystals". What's the workaround for this if anyone knows?
Edit: I found a workaround for now, just change the narcotics from plural to singular form by removing the s, and thats it.
Fantastic search items mod. So far, there is literally only one issue with this mod. So far, I have found a few guns amongst many peds, and all of them cannot be traced and instead says I did not find a firearm.