Pinal County deputies busted a counterfeit money ring in San Tan Valley on Sept. 2 after starting an investigation in August.
Alicia Green, 31, Henry Stevenson, 27, Nancy Burke, 42, and William Burke, 45, were arrested last week under suspicion of fraudulent schemes and forgery, according to PCSO.
Authorities allege the four suspects either participated in making and circulating counterfeit $20 or knew about the illegal operation.
PCSO said the case started on August 19 when deputies received a report from WalMart where a fake $20 bill was passed. Security footage reportedly showed Henry Stevenson use the bill before driving off in a black Mercedes.
Deputies were able to identify Stevenson's car because he was arrested in June and found to be in possession of counterfeit money.
Authorities searched Stevenson's home on Sept. 2 and found hardware, paper and waste evidence in a bedroom shared with Alicia Green. Meth and drug paraphernalia was also found.
Sheriff Paul Babeu said his office is continuing to investigate to see if more businesses have been victimized.
The four suspects are being held on $50,000 bond at Pinal County Adult Detention Center.
