Please assess the completion status of the following clinical trial:

Trial Title: Kappa-PET Imaging and Naltrexone in Alcohol Drinking Behaviors

Study Design Characteristics:
- Allocation: None
- Intervention Model: SINGLE_GROUP
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: NONE
- Phase: PHASE1
- Number of Arms: 1.0

Eligibility Criteria:
Inclusion Criteria:~* Ages 21-50~* Able to read English at 6th grade level or higher and to complete study evaluations~* Regular alcohol drinker~Exclusion Criteria:~* Individuals who are seeking alcohol treatment~* Medical conditions that would contraindicate the use of study medication~* Regular use of other substances

- Gender: ALL
- Minimum Age: 21 Years
- Maximum Age: 50 Years
- Healthy Volunteers: f

Study Arms:
- Naltrexone (Type: EXPERIMENTAL): None

Based on this trial design, predict the completion outcome and termination type (if applicable).