My main concern is these devices causing bodily harm

That's a reasonable, genuine concern, and one that should require physical interlocks (not just software code) to guard against.

That's a good situation for mandatory safety codes (such as the FDA requirements for 2 physical interlocks on microwaves [1]).

[1] http://www.accessdata.fda.gov/scripts/cdrh/cfdocs/cfcfr/CFRS...