After leaving JPL, Parsons attempted to establish himself in various business ventures, often related to his scientific expertise. However, these ventures were often unsuccessful and fraught with financial difficulties.

Parsons traveled to Mexico, where he became entangled in allegations of espionage. He was suspected of trying to sell rocket secrets to foreign powers, although these allegations were never definitively proven.

Parsons was under investigation by the FBI due to his unconventional lifestyle, occult activities, and alleged involvement in espionage. His security clearance was permanently revoked, hindering his ability to find employment in his field.

Despite his difficulties, Parsons continued to work as a consultant and chemist, taking on various projects to make a living. However, he struggled to regain the professional success he had achieved at JPL.

Parsons faced multiple legal battles, including disputes over property and business ventures. These legal troubles added to his financial strain and contributed to the stress and instability in his life.