It can it be found easily by sampling like

It has been referred
to as hidden addiction as there are neither physical signs of withdrawal nor
can it be found easily by sampling like urine drug screening(15). In various
studies it has been found that the prevalence of pathological gambling is four
to ten times higher in substance users compared to the general population; More
common among people with alcohol use disorders compared with those with other
substance use disorders(16). Comorbid gambling disorder and alcohol use
disorders tend to be more prevalent in treatment as compared to community
samples(9). Problem
gambling is associated with poorer response to substance abuse treatment among
patients with co-occurring substance use disorders(17).