"Hello. May I come in and ask you a few questions?"

He didn’t really need to ask you for your permission. He was just being polite and respectful. He could have simply walked in and started asking his questions without waiting for your response. His courteous approach made you feel more at ease and willing to cooperate with him. You nodded and stepped aside, allowing him to enter your home. As he began his questioning, you couldn't help but feel a sense of unease.