DUBUQUE, Iowa — A 46-year-old Dubuque man was arrested early Saturday on a felony controlled substance violation charge.
Michael John Mastin, described as a white male, was taken into custody at approximately 2:59 a.m. on Aug. 8, 2026, near the intersection of 1954 Asbury Road and Bunker Hill Road in Dubuque, according to arrest records.
The charge is listed as a Controlled Substance Violation (F). Arresting officer is identified as Surface, E. The arrest is recorded under number AR 2026002240.
Mastin was held on a $30,000 cash bond.
No additional details regarding the specific substance, circumstances of the stop, or further charges were immediately available in the public arrest information.
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