The four main suspects arrested after the terrorist attack on the Crocus City Hall concert venue near Moscow were allegedly under the influence of drugs when carrying out the mass shooting, according to a report by Russian state news agency TASS. “Which drugs or psychotropic drugs they consumed will be determined by an expert,” TASS reported on Thursday, citing investigators. The report suggested that the suspected perpetrators could have been under the influence of drugs not only on the day of the attack itself, but also beforehand. The Islamic State terrorist militia has claimed responsibili…