All 411 Interventions are GUARANTEED interventions. An unsuccessful intervention is an intervention that does not end with your loved-one entering a treatment program. If the intervention does not conclude with your loved-one entering a treatment program, then you will not be expected to pay for the intervention fee. The only fee you will be responsible for is Airfare. The only condition required to qualify for the 411 Intervention Guarantee is that you MUST follow the directives given to you by your intervention specialist.