Government Grants

I have an idea that I have patented and I want to start research and development on. This idea will become a matter of public safety and I can see it becoming a law or mandated. It is WILL absolutely save lives.

Does anyone know of a good place to start applying for a government grant? Should I actually look at other grants instead of government grants, considering that this will likely become a matter of public and poltical interest?
I think I posted this in the wrong place…. it should not be under education?

Dorothy