In June 1983 Weerasinghe, the Senior Deputy Inspector-General of Police, was one of two senior Sri Lankan police officers who were invited by the British government to Belfast to "see at first hand the roles of the police and army in counter-terrorist operations". The visit was cut short following the anti-Tamil pogrom and riots in Sri Lanka during July. He was appointed as Inspector General of the Sri Lanka Police by President J. R. Jayewardene on 20 April 1985. He retired from the Police Service in December 1985.