Check If Google Analytics Script Is In The Page Template

hasAnalyticsGoogle.js

function hasAnalyticsGoogle(){
    var scripts = document.getElementsByTagName('script'),
        ga = true, ua = true, dc = false,
        i, len, s;
    
    len = scripts.length;

    if (ga || ua || dc) {
        for (i = 0; i < len; i += 1) {
            s = scripts[i].src;

            if (
                (ga && s.indexOf('google-analytics.com/ga.js')>-1) ||
                
                (ua && s.indexOf('google-analytics.com/analytics.js')>-1) ||
                
                (dc && s.indexOf('doubleclick.net/dc.js')>-1)
            ) {
                return true;
            }
        }
    }
    return false;
}