Specially manufactured weaponry and instruments of single or mass death. Customised biological weapons is the next big order.
The power for criminals, Governments and others is in the ability to customise deadly virus organisms specifically suited to the target DNA. This means that you can be ‘taken out’ (not for coffee, but into a coffin) directly. All that is required is a sample of your DNA (hair, saliva etc).
Technology that is being used to prepare DNA specific cancer treatments could easily be used for additional purposes as individual DNA sequencing becomes a trivial and daily event.
Soon a crime syndicate (or basically anyone) in your area can cause your heart attack, liver failure, flu virus, ‘insert cause of death here’ without much fuss. Who is to know what really happened?