Please assess the completion status of the following clinical trial:

Trial Title: The Effect of a Contingency Management Intervention on Substance Use

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: PARALLEL
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: NONE
- Phase: None
- Number of Arms: 2.0

Eligibility Criteria:
Inclusion Criteria:~* veterans presenting for outpatient substance use disorders treatment with a diagnosis of alcohol, cocaine, amphetamine, or methamphetamine dependence~Exclusion Criteria:~* primary cannabis dependence~* primary opioid dependence~* severe psychiatric symptoms~* suicide risk~* positive history or screen for pathological gambling~* lacking transportation or living too far away to attend twice per week research appointments

- Gender: ALL
- Minimum Age: 18 Years
- Maximum Age: None
- Healthy Volunteers: f

Study Arms:
- Contingency Management (Type: EXPERIMENTAL): Participants complete urine and breath screens 2 times per week for 8 weeks. If urine and breath screens are negative, they receive a chance to draw tokens from a bowl. Some tokens are social reinforcement. Others have monetary value.
- Placebo (Type: PLACEBO_COMPARATOR): Participants complete urine and breath screens 2 times per week for 8 weeks with no reinforcement for negative results.

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