you would have to infiltrate an extremely guarded facility
you would somehow have to bypass QA
its not like somebody on the assembly line for a new protein drug sprinkles a dose of PCP
one potential dual use could be somebody modifying a popular fruit with birds and then droppin seeds at the local organic farm fair
and then when those seeds are consumed by birds they produce poop dangerous for other animals to consume
you could absolutely screw around with the ecosystem, like whoever has access to this programmable "bio-wafer" will be able to play god totally undetected.
the problem is that "bio-wafer" manufacturing process will be very tough and regulated like the CNC machines used to manufacture jet engines depriving certain countries from being able to churn out their own jet engines