A young patient with amphetamine addiction has rampant caries. Which is the most valuable radiographic series to prescribe?

For a patient with extensive/rampant decay, a full mouth periapical series provides the detailed, high-resolution diagnostic information (interproximal and periapical detail on every tooth) needed for comprehensive caries detection and treatment planning — more thorough than a panoramic (which has lower resolution for caries detection) or bitewings alone (which don't capture anterior teeth or periapical detail).