Mystery surrounds the disappearance of high-profile Lao activist Sombath Somphone, almost three weeks after he was last seen.
Mr Sombath's wife, Ng Shui Meng, says police have not contacted her about the case for over a week.
"The CCTV footage shows that he was last stopped at the police post [in the capital Vientiane], that his jeep was driven away by unknown person right at the police post and he was taken away in a truck which stopped at a police post," Ms Ng told Radio Australia.
The government has denied any involvement, hinting at a possible business or personal conflict as the reason for his disappearance.
Mr Sombath is well known in the region, and received the prestigious Ramon Magsaysay Award in 2005 for his work in community leadership.
He has been involved in a number of environmental and land rights causes but his wife denies he is a dissident.
"I don't know whether such work would upset any vested interests, but from my own understanding his work has never been provocative."
Ms Ng says she does not know if her husband is in police custody.
"I only believe what I've seen on the CCTV footage, and if the government says it does not have him in custody, I have nothing to counter that either."
[Editor’s note: an earlier report had incorrectly quoted Ms Ng Shui Meng as saying "(Mr Sombath’s) jeep was driven away by a known person..."]