Bail has been set at $30,000 for a Naperville man accused of selling counterfeit Valium, according to the Cook County sheriff.

Amin Rupani, 40, of the 2600 block of Salix Circle in Naperville, has been charged with unlawful possession of a controlled substance.  He was arrested at his computer business, Precision Technologies, in the 1500 block of Midway Court, in Elk Grove Village.

The Cook County Sheriff's Police Special Operations Unit began its investigation into Rupani's activities after the U.S. Food and Drug Administration, along with the U.S. Customs and Border Patrol, detained a package containing counterfeit Valium pills, according to a sheriff's department release. The 20,000 pills packed inside plastic containers had Rupani's business address but a fake name, police said.

On Dec. 9, CCSO investigators, along with agents from the USFDA and the U.S. Postal Service, wired the Valium package with a monitoring and tracking device and conducted a controlled delivery to Rupani's office, police said. When officers received a radio transmission signal that the package had been opened, they entered the business and placed Rupani under arrest, according to the release.

Rupani told investigators he received the packages from a friend who lives in Karachi, Pakistan, and that he was told the pills were vitamins and weight loss drugs.  Forensic tests of the seized pills show they contain the active ingredient in Valium but were manufactured by a criminal enterprise in China.  The estimated street value of the drugs is $200,000.

Rupani admitted he forwarded the packages sent by his co-conspirator to addresses in Texas and California on a regular basis using his company's UPS account, according to police. After a search of Rupani's business, officers also recovered nine plastic bags containing an estimated 20,000 light green triangular pills, suspected counterfeit Xanax and a box of diet pills.