As mentioned by another contributor IT workers (inc DBA's) do not belong to professional bodies such as Doctors, Nurses etc where you can only get a job if you are a member of these bodies. Any members of these bodies who are struck off cannot work until reinstated. There are no such bodies in the IT industry.

Having said this, in the EU there are already existing laws under which you can feasibly be prosecuted for disclosures/theft of data albeit the organisations that enforce/investigate these breaches are largely toothless and do not operate outside of the EU.

So until the IT industry actually has a professional body with all the cumbersome overheads and membership dues all the talk about DBA ethics is interesting but unenforceable.