Government surveillance video has emerged of the moment two officers seemingly encouraged a high school student to drink liquid methamphetamine, two hours prior to his death.

In the video, obtained by ABC News in the US and filmed in 2013, two US Customs and Border Protection officers are seen smiling to each other as they appear to encourage 16-year-old Cruz Velazquez to drink from a bottle of yellow liquid.

The liquid was later proven to be methamphetamine, which had been liquefied.

Cruz died within two hours of ingesting the substance.

No disciplinary action been taken against the two officers seen in the video, Valerie Baird and Adrian Perallon, who remain on the job.

The former head of internal affairs at U.S. Customs and Border Protection, James Tomsheck, said their actions clearly violated agency protocols.

“If they truly suspected there was a controlled substance in the bottle they should've conducted a field test,” Mr Tomsheck said.

Ms Baird and Mr Perallon both denied asking Cruz to drink from the bottles.

In the video, Cruz drinks from the bottles four times, at the request of Ms Baird and Mr Perallon. He was detained after a trained dog detected the presence of drugs, but after half-an-hour he began complaining that he felt sick and admitted the liquid was a chemical.

Cruz was taken to the Sharp Chula Vista Medical Center where he died within two hours.

His family have since filed a civil lawsuit against Ms Baird and Mr Perallon, claiming their actions led to Cruz’s death.

The Velazquez family attorney, Gene Iredale, said the surveillance video proves the two officers took joy from making Cruz drink from the bottles.

“What you see, I think, is a basic lack of compassion and decency toward a 16-year-old boy,” Mr Iredale told ABC News.