Not weed related or any drugs for that matter but when arrested in the UK i only ever give my name, age, address, medical info... I then request a solicitor and wait...

Once the solicitor turns up and asks me "Are you guilty" i always tell the truth. Tell your legal rep the fucking truth and give them as much details as possible as there job is to get you out of trouble and if you keep shit from them and the police turn up with evidence they never knew about it's like being caught with your pants down and a child swinging from your balls.... You aint getting out of that shit no matter how much you try.

Don't tell the cops anything as they need to prove you're guilty. But tell your legal rep everything as their job is to get you out the shit.