It takes some tinkering the main thing is that the "-dmS" flag allows screen to start without a session which of course sudo won't have.
solution:
/usr/bin/sudo -u user /usr/bin/screen -dmS nameyouchoose
/script/start.bash
this doesn't work at all:
/usr/bin/sudo -u user "/usr/bin/screen /script/start.bash"
this doesn't work:
/usr/bin/sudo -u user /usr/bin/screen /script/start.bash
bash, etc, rc, startup, userit, tinkering, quot, dms, allows, sudo, usr, bin, user, nameyouchoose, doesn,