They do look very 'azureish'... If its obvious you are deliberately trying to grow only the mushrooms then I'm sure they could hit you for manufacture if they wanted to. If you could argue that is was genuinely an accident then as long as you didn't pick them or have any in your house then Im sure they wouldn't bother you. And lastly, I think the police have a very important job to do these days, and I don't envy them. But I'm sure (at least I would hope) that 'they' have the clarity and professionalism to put in to perspective the lack of an issue surrounding someone with a foam tray of woodchips with enough little fungi popping up for two mature people to have a 4 hour giggle and a life changing, relationship building evening together in the privacy of their own loungeroom. If they don't, then I can assure you they aren't the sort of people that I want 'serving and protecting' me from some of the real horrors that take place in current society.