checkPolicyFile = true;

programming flash
1 
    var context:LoaderContext = new LoaderContext();
    context.checkPolicyFile = true;
    
    var loader:Loader = new Loader();
    //Security.checkPolicyFile = true;
    var img_url:String = img_src;
    var request_url:URLRequest = new URLRequest(img_url);

    loader.load(request_url);

For some reason the loader isn’t checking the policy file, how do you called “checkPolicyFile = true” correctly?