Even people with mild colorblindness can be barred from being pilots, air-traffic controllers, police officers, lab technicians and electricians usually for safety reasons.
Michael McMahon (Hamilton North and Bellshill, Lab) asked whether he was aware that some police officers had asked for more powers to tackle anti-social behaviour.
Still, the spokesman added, police are sending DNA evidence from this case and 26 others to a private lab for testing under a grant from the Justice Department.
Researchers from the MIT Poverty Action Lab showed that, in one state, reforms to increase training marginally improved the police effectiveness and public image.