I elaborated on this in a reply to the comment parallel to yours, but: by "bioweapons" I really meant "science behind bioweapons", which happens to be just biotech. Biotech
is, like any applied field, inherently dual-use. But unlike nuclear weapons, the techniques and tools scale down and, over time, become accessible to individuals.
The most risky parts of biotech, the ones directly related to bioweapons, are not made publicly accessible - but it's hard, as unlike with nukes, biotech is dual-use to the very end, so we have to balance prevention and defense with ease of creating deadly pathogens.