This might sound a little abstract, but the government can nullify bodily autonomy legally in some cases, namely:

Circumcision: The skin of the penis in male babies can be taken from us with out our consent.

Conscription: Think about drafted war veterans who have lost limbs and such. They should have had the autonomy to keep those body parts, however they were forced to sacrifice them for the sake of the state (think about how we say soldiers give their lives, for their country.)

Also, the organ donation is a variation of Judith Thompsons violinist, which has been criticized already https://rintintin.colorado.edu/~vancecd/phil215/Warren.pdf