Final answer:
Past bankruptcies, lawsuits from former business partners, and recent DUIs are more important to know about a potential business partner than a 15-year-old marijuana possession arrest.
Step-by-step explanation:
The least important information to know about a potential business partner would be a 15-year-old marijuana possession arrest. While past bankruptcies, lawsuits from former business partners, and recent DUIs can provide insight into a person's financial stability, trustworthiness, and decision-making abilities, a 15-year-old marijuana possession arrest is less relevant to their current business capabilities.