RedFlag

What RedFlag saw in Scott Peterson's 2003 TV interview

← All articles · By the RedFlag team · September 26, 2026

Laci Peterson, eight months pregnant, disappeared from Modesto, California on December 24, 2002. In late January 2003 her husband Scott Peterson gave a series of television interviews, including this one with CBS13 Sacramento, talking about her disappearance. RedFlag is not a lie detector — it measures where a speaker's voice and face diverge from their own baseline and leaves the interpretation to you.

The public record is settled. In November 2004 a jury convicted Scott Peterson of the first-degree murder of Laci and the second-degree murder of their unborn son, Conner. His death sentence was later reduced to life without parole; the conviction stands. We publish this analysis with respect for the victims; it examines only what is measurable in the recording.

The analyzed video

RedFlag's analysis of the clip. The screen turns red during flagged moments, a green bar marks stretches within normal range, and the counter climbs as each flag is caught.

Overlay rendered from the analyzer's own output for this clip (same pipeline as the app's capture mode). Original clip: YouTube ↗.

What RedFlag flagged

Across the clip, RedFlag flagged 44 moments totalling 10 minutes 22 seconds. Each flagged episode lasts at least 3 seconds; shorter blips are dropped as measurement noise.

#TimestampLength
10:02 – 0:1715s
20:21 – 0:3210s
30:40 – 0:444s
40:47 – 1:1830s
52:27 – 3:0740s
63:22 – 3:4928s
74:01 – 4:054s
84:23 – 4:3916s
94:47 – 4:536s
104:57 – 5:5962s
116:42 – 7:1736s
127:21 – 7:4928s
137:52 – 7:586s
148:04 – 8:106s
158:32 – 8:354s
168:39 – 8:478s
178:53 – 9:1825s
189:22 – 9:319s
199:36 – 9:4914s
2010:01 – 10:054s
2110:09 – 10:178s
2210:46 – 10:516s
2311:16 – 11:193s
2411:23 – 11:264s
2511:36 – 11:458s
2612:36 – 13:3558s
2713:40 – 13:499s
2814:24 – 14:5430s
2915:18 – 15:224s
3015:26 – 15:304s
3115:34 – 15:5319s
3215:58 – 16:046s
3316:16 – 16:2812s
3416:44 – 16:473s
3516:53 – 16:564s
3618:03 – 18:1411s
3718:18 – 18:213s
3818:34 – 18:396s
3918:56 – 19:026s
4019:10 – 19:3727s
4119:49 – 19:534s
4219:59 – 20:089s
4320:28 – 20:4315s
4421:33 – 21:4310s

What the signals did

SignalFlagged momentsRest of the clip
Pitch variability (F0 semitone SD; normal band 2.3–4.5)2.52 st3.96 st
Blink rate10.22/min10.04/min
Voiced continuity0.160.15

This one is almost entirely vocal. Across the flagged moments Peterson's pitch variability averaged 2.52 semitones against 3.96 in the rest of the interview — a sharp relative flattening, with individual stretches dropping below the 2.3–4.5 band typical of engaged conversation. His blink rate barely moved (10.2 vs 10.0 per minute), so the eyes carried almost none of it. A result this dense — close to half the interview — also deserves a caution: this is 2003 broadcast audio on a single mixed track that includes the interviewer's questions, and both affect pitch measurement. Thresholds are public in the scoring method.

What this does and does not mean

It does not mean the analyzer detected a lie. Flattened pitch, blink changes and unusual voicing all have innocent causes — rehearsal, fatigue, a hostile room, a hard question. The honest reading is narrower: at these moments, this speaker's delivery deviated from his own baseline in a measurable, repeatable way. What that meant is a judgment, and here the public record has already made it.

Run your own. Paste any public YouTube interview with a single speaker into the analyzer — free, no signup, in your browser. RedFlag charts the signals; what they mean stays your call.

Open the analyzer

Test your own judgment · Case study: Lance Armstrong, 1999

Sources