Background check, drug test, e verify, and must speak English (it's a safety thing, that makes it legal). must have Xerox copies of drivers license, social security card.
You would be surprised how many people get up and walk away from an interview. They are not people you want anyhow.
Also make it a requirement to bring and show you their PPE. Work boots, long pants, eye protection, hearing protection. Those that do are serious about working.
After that tell them that is a performance part of the interview, they have to run the mower, weed eat, and edge, then blow. (this can be any open field or you own house.)