A police report obtained Thursday links Rick Van Thiel with a 69-year-old woman accused in 2013 of plotting with another anti-government believer to kill Las Vegas police.
She was eventually convicted of misdemeanor conspiracy and received probation.
The 52-year-old Van Thiel is jailed pending an Oct. 20 preliminary hearing on multiple felony charges.
Police say a Sept. 30 search of a trailer he used found records suggesting he treated people for pregnancies, cancer, sexually transmitted diseases and even tooth extractions.