You have to be aware that many companies have field operations that require (in the US) very large insurance plans. A stipulation of many of these plans are tha

You have to be aware that many companies have field operations that require (in the US) very large insurance plans. A stipulation of many of these plans are that all employees must refrain from certain drugs. It is in these cases that what goes on outside of work can creep into the scope of the company. If you are getting high on the weekend and have an unrelated plane accident on Monday, the company's insurance might be able to claim breach of contract and not cover the accident.