It really depends where you're from in CA. For UNR Med, if you're from one of the CA counties that borders Northern Nevada (Placer, Eldorado, Lassen, Sierra, Nevada, etc.) then you've got a real chance.
Second to this would be if you were from very rural counties in CA and you have a STRONG tie to NV can play that card heavily (Shasta, Amador, Eureka, Plumas, Butte, Mono, etc). Strong ties include: You've been working in Northern Nevada for over the past year, your husband/wife lives in Northern Nevada or is already a student at UNR Med, and maybe something else too but these must be legit uber strong ties.
After these two categories you're pretty much just a regular OOS applicant and you're unlikely to gain admission no matter how rad you look on paper. Don't waste your money.
I can't really speak to UNLV SOM but I can say that there's plenty of Nevada applicants already (specifically those from Las Vegas or Southern Nevada). I'd imagine they also give strong preference to in-state over OOS.