29
When the Other Side Knows Too
The most honest chapter in the set. It lists what can be faked, what cannot, nine situations in which everything in the other thirty chapters is unusable — and one line this set does not cross, with a reason that is not mere moralising.
Three strategies of the experienced
A source who has been in this situation before does not improvise. They have a strategy, and their strategy is fairly consistent.
The limits of faking
The most common question: can body language be faked? The general answer is no — but the full answer is more interesting.
Fakeable
- Open palms — the easiest of all
- Upper-body posture
- Deliberate facial expression
- Amount of eye contact
- Tone of voice
- The content of what is said
NOT fakeable
- Pupil contraction and dilation
- Sweating
- Blushing and neck flushing
- One eyebrow raised
- A twitch at the corner of the mouth
- Micro-mirroring — blink and pupil synchrony
And the most important limit is time
Those who fake can only do it for a short time. Even the very skilled can only fake body language for a while. In the end the contradictory signs emerge, independently of any conscious action.
The practical consequence: the longer the meeting, the greater your advantage. If you suspect you are watching a performance, do not push — stretch it out. And watch the end of the session, when their concentration has run out.
The two ways professionals lie — and the traces each leaves
Method one — rehearsing gestures
Rehearsing gestures until they “feel real”. This only works with frequent practice at lying over a long period.
The traces it leaves: facial asymmetry (see chapter 18), emphasis in the wrong place or arriving late (chapter 21), and the wrong opening order — hands opening before legs (chapter 12).
Method two — suppressing all gesture
Showing nothing at all, positive or negative. This is not as simple as it sounds either.
The traces it leaves: a freeze state (chapter 21), a flattening of emphasis across the board, and an abnormal poverty of signal against their own baseline.
Both methods share one weakness: they make the person look unlike themselves. And that is exactly what the baseline law is designed to catch.
The lesson of the dyed birds
The lesson runs both ways
Defensive. Disguising the surface is not enough to get past an observer who knows how to look — the body still leaks the internal state.
Active. If you want to be taken seriously, you have to change the internal state, not just the form. And by the two-way causation in chapter 11, posture is one of the ways into that state — so the two cannot be separated.
Nine situations in which this system will fail
This is the honest list. Knowing them in advance matters more than knowing twenty more signals.
| # | Situation | Why it fails |
|---|---|---|
| 1 | A liar who believes his own lie | With no internal conflict there is no leakage. No technique in the whole set catches this case. This is the case of total failure |
| 2 | A small lie embedded in a large truth | Most of the account is true and costs nothing, so cognitive load is low and the signals are diluted |
| 3 | A well-prepared lie | Low cognitive load — the model in chapter 25 weakens considerably |
| 4 | A person with a neurological difference | Zone 9 (mirroring) may be entirely void, and many other signals depart from the standard for neurological reasons rather than attitude |
| 5 | A person very familiar with impression management | They treat steering other people's perception as a skill, and their background emotion may differ from the standard |
| 6 | A large cultural difference not corrected for | The whole baseline is wrong — not slightly wrong but systematically wrong |
| 7 | By telephone or in writing | Eight of the nine zones are lost. The best way to lie is over the phone or in writing. Only the vocal entrainment layer and the verbal layer remain |
| 8 | You already hold a prejudice | Confirmation bias swallows the whole system. You still run every procedure correctly and still reach the wrong conclusion |
| 9 | No chance of independent verification | You never reach a conclusion — only a hypothesis. And an unverified hypothesis is no different from a decorated guess |
The last three situations are the three you control
Situation 7 is your choice of channel — if this matters, meet in person. Situation 8 is your choice of procedure — write the alternative hypothesis on paper. Situation 9 is your choice about the scope of your conclusions — if you cannot verify, do not conclude. The first six you can only recognise and accept; the last three there is no reason to run into at all.
The line not to cross
A system for reading people is incomplete if it does not say plainly where it stops and why. This section does that.
What this set does not include and does not support
- Causing pain or threatening to cause pain
- Deprivation of the senses, of sleep, of food, of water
- Inducing physical debility
- Using drugs to influence a statement
- Threats aimed at family members
- Humiliation, forced nudity, using religion or ethnicity to humiliate
- Prolonged stress positions
- Any method applied to a person who is not free to leave
And the reason is not mere moralising
There are four separate lines of evidence pointing the same way, and they deserve to be set side by side:
What is kept from the other side of the line
Understanding the mechanisms of coercion still has value — not in order to use them, but in order to recognise when you are creating them by accident.
| Kept | Why |
|---|---|
| The personality-sketch framework | As a set of preliminary hypotheses about how to approach someone — with the warning about labelling, in chapter 23 |
| The theory of environmental control | To recognise when the environment is suppressing someone, and to reduce it — chapter 23 |
| The mechanism by which suppression leads to slips | To know what is happening when you create pressure by accident, and to stop in time — chapter 19 |
| The warning about false confessions | A person racked with guilt may confess to something they did not do, and the accusation is what triggers it. This is the most important warning in this whole section — it applies to every reader of people, including inside a family |
| The principle about emotional resistance | Emotional resistance cannot be dissolved by argument. In this set, dissolving it means empathy and rapport, not fear |
Chapter exercises
One. Read the list of nine failure situations again. For each one, write a sentence: in your work, how often does that situation come up?
Two. If one of the last three — channel, prejudice, no verification — comes up often, fix it this week. All three can be fixed.
Three. Ask yourself one hard question: have you ever pushed someone to the point where they agreed to something they did not really agree with? What happened afterwards?
Chapter summary
- People who have been questioned before do not improvise; they have three fairly consistent strategies: say as little as possible · work out what the questioner is after, then reveal only what does not matter · do not hold back what they believe you already know. Each strategy has a tested counter.
- Fakeable: open palms — the easiest of all — upper-body posture, deliberate facial expression, amount of eye contact, tone of voice, the content of what is said. Not fakeable: pupil contraction and dilation, sweating, blushing and neck flushing, one eyebrow raised, a twitch at the corner of the mouth, micro-mirroring.
- The real limit on faking is time. Even the very skilled can only keep it up for a while. So the longer the meeting, the greater your advantage: do not push, stretch it out, and watch the end of the session, when their concentration has run out.
- Both ways professionals lie leave traces. Rehearsing gestures leaves facial asymmetry, emphasis in the wrong place or arriving late, and the wrong opening order. Suppressing all gesture leaves a freeze state and an abnormal poverty of signal. Both make the person look unlike themselves — exactly what the baseline law is designed to catch.
- Weak birds dyed a darker plumage were still attacked by the genuinely strong ones, because they gave away submissive body language. Disguising the surface is not enough; the body still leaks the internal state. The other direction: to be taken seriously you have to change the internal state, and posture is one of the ways into it.
- The case of total failure: a liar who believes his own lie. With no internal conflict there is no leakage, and no technique in the whole set catches this case.
- By telephone or in writing you lose eight of the nine zones, leaving only the vocal entrainment layer and the verbal layer. The best way to lie is over the phone or in writing — so if this matters, meet in person.
- With no chance of independent verification you never reach a conclusion, only a hypothesis. An unverified hypothesis is no different from a decorated guess.
- Of the nine failure situations, the first six you can only recognise and accept. The last three — channel, prejudice, no verification — are all your own choice, so there is no reason to run into them.
- The line: no pain, no deprivation of the senses or of sleep, no drugs, no threats against family, no humiliation, and no method of any kind applied to a person who is not free to leave. The reason is not mere moralising: accusatory methods make the interrogator talk more than the subject, so fewer markers are collected; coercion strengthens out-group identity; a questioner perceived as insincere gets compliance rather than cooperation — the two look alike for the first ten minutes; and non-coercive methods are relatively more effective precisely with the least cooperative sources.
- A person racked with guilt may confess to something they did not do, and the accusation is what triggers it. This warning applies to every reader of people, including inside a family — where “free to leave” is at its vaguest.