Again if any of you are interested I produced a document a few years ago for the street work project I was director of on making a case for supporting our work - financially speaking. I made the arguments about investment now Vs paying for prison costs later....this will give you some ideas on how to maybe market your own arguments because it uses previous research that's 'out there' to underpin the arguments for investing in young people at a young age.
Hope it helps.
Fergal