1. Title as the costume question

Is the white coat a halo effect?

2. The answer in one line, and the correct name

Not on the evidence so far. The halo effect is a rating error. People obeying a uniform looks like a different mechanism (editor's framing). The correct name is authority cues and official signals.

3. Why the costume feels right

Both start with something visible about a person, and both change how others respond to them. That shared surface is why the two get mixed up. (Editor's framing, not a finding.)

4. The difference that matters

The halo effect is about ratings. Thorndike described raters' "marked tendency to think of the person in general as rather good or rather inferior" and "to color the judgments of the qualities by this general feeling" (Thorndike, Journal of Applied Psychology, 1920).

Authority cues are about compliance. In two field experiments, people were more likely to pick up a paper bag, give a stranger a dime or move away from a bus stop when asked by a man dressed as a guard than by one dressed as a civilian or a milkman. The author argued the guard's power rested on legitimacy (Bickman, Journal of Applied Social Psychology, 1974).

A white coat did not raise trust in one trial. In Portuguese primary care, 286 patients saw one of 16 physicians with or without a white coat. There were "no statistically significant differences between the groups in terms of satisfaction, trust, empathy and knowledge perceived by the patients" (Carreira et al., BMJ Open, 2021).

In India, faking official status is also a legal question. The Bharatiya Nyaya Sanhita, 2023 came into force on 1 July 2024. Section 204 covers personating a public servant; section 205 covers wearing the garb or carrying the token of a public servant with fraudulent intent; section 319 covers cheating by personation. Separately, the CCPA's Guidelines for Prevention and Regulation of Dark Patterns, 2023 (30 November 2023) list 13 specified dark patterns, including false urgency, disguised advertisements and trick wording. Guidance, not legal advice; a lawyer confirms how any of this applies.

5. The correct mechanism's badge and two cases

Not yet stamped. Two cases are not yet graded: Bickman (1974, field experiment, USA) and Carreira et al. (2021, interventional study, Portugal).

6. Open gaps

• The punishments under BNS sections 204, 205 and 319 have not been read on an official full text yet, so they are not stated here.
• No Indian study of uniforms or official-looking cues and compliance has been found yet.
• How official cues change survey answers (this page's detection angle) is not yet written.