Is the preposition used with substitute same / fixed in all sentences or it changes with meaning ? I tried to find my answer from google and found sentences mostly using for with substitute, on oxford dictionary website its mentioned that verb substitute is traditionally followed by for
so are there any exceptions to this rule ? I have confusion between to and for in the following sentence.
It is not a substitute ____ the formal criminal justice system, but a good backup to reduce its workload .
What should come in the blank ? Substitute for or substitute to ?