honeypots are not allowed in germany afaik. The police is not allowed to sell drugs or ask people for drugs and then take them in
However, buying or selling weapons is no joke here.
You can buy an amount of weed here (for personal) use that would absolutely get you convicted with "intent to supply" in the UK.
My weed smoking friends were worried they wouldn't be able to pick up when they came to visit. It was not a problem.