Could they work before attending?
For example, See MPH at Johns Hopkins, Bloomberg Fellows or Welch Scholarship for example. https://www.jhsph.edu/academics/degree-programs/master-of-public-health/tuition-and-scholarships/index.html
For law, see law school admission council
https://www.lsac.org/choosing-law-school/paying-law-school/law-school-scholarships
Or try Peace Corps and Coverdell Fellows program.
https://www.peacecorps.gov/volunteer/university-programs/coverdell-fellows/