We need a good hard look at all sentences for attack, particularly with a weapon. Acid, knife or a gun should not matter and I would go along with the 20 years min for all the above as long as it is that, nothing off and no parole.
I agree with the post above on halving of sentences. It should be stopped, if you dont behave then time added.
We do need to build some proper prisons to house these people though, they need to be efficient and just enough to avoid human rights issues although I still favour outsourcing to Thailand or Turkey where they know how to run a jail.
I am also getting fed up of headlines blaring out what seems to be an appropriate only to find it is a total for a group and its divided amongst them.