CHANDIGARH: The Punjab police have arrested Harpreet Singh, the brother of pro-Khalistan MP Amritpal Singh, and another person under the NDPS Act on drug-related charges after methamphetamine also known as crystal meth was recovered from them. Sources said Harpreet Singh and Lovepreet Singh were arrested from the Phillaur check post as they were travelling on the Phillaur-Amritsar highway after four …