Hi Guys I dont know if you know about this its the FCC OET BULLETIN 63 & 65 Lots of good informations these are pdf files.
1) Fcc Regs for low power no licensed transmitter www.fcc.gov/…/Documents/bulletins/oet63/oet63rev.pdf
2) Rf On Human Exposure www.fcc.gov/…/Documents/bulletins/oet65/oet65.pdf