Final answer:
The police are questioning Aksionov on the suspicion that his drinking habits may be linked to criminal behavior, though they lack direct evidence of his involvement in the armed robbery.
Step-by-step explanation:
The police are questioning Aksionov because they suspect he might have a habit of drinking, which, in their experience, could be related to criminal behavior. However, the main answer and reason for their suspicion are not explicitly stated in the given information. The scenario implies that while the police have evidence of an unlawful weapon possession, this does not directly prove Aksionov committed the more serious crime of armed robbery.
In investigations, law enforcement officials often question individuals when they have some evidence or reasonable suspicion of involvement in a crime. As they gather more information and evidence, such as witness testimonies or physical evidence, they may either confirm or discard their initial suspicions. Until direct evidence linking Aksionov to the armed robbery is found, the police can only theorize about his involvement based on indirect clues and their knowledge of his habits and past behavior.