One of my best friends has just started to go out with a real low-life. How much information about his drug dealing would I need to get him into trouble (as serious as possible) with the police? At the moment I have only second hand information, not enough I think to cause him any trouble. Obviously I don't want to commit any crimes myself or put myself in any dangerous situations. I just want to know how much constitutes a 'tip off.'
Any help much appreciated! Oh and this is in the UK.