Drink driving

• Can I be arrested if I am sat in my car drunk (over the permitted limit), but not driving?
• Can I be charged with drink driving if I am over the limit but just sat in my car?
• Do the police need a reason to stop me whilst I am driving?
• How much alcohol can I drink and not be over the limit?
• I know someone, who drinks and drives all the time, what should I do?
• If I go out drinking on a night, what are the possible effects on my driving the next day?
• If I suck a copper coin, will it invalidate the breathalyser test?
• I'm confused about the law in relation to drug driving. Please can you clarify what the legal position is?
• Under what circumstances can I be stopped and given a breath test?
• What is dangerous driving?