The One Direction stars were captured on film joking about smoking marijuana as they passed around a suspicious looking roll-up cigarette as they were reportedly being taken to Peru's Estadio Nacional in Lima on April 27.
Louis, 22 - who is holding the camera during the clip which was obtained by the MailOnline - can be heard saying: ''So here we are, leaving Peru. Joint lit. Happy days!''
As the pair pass by a police officer, he shouts: ''That's the police. That's the po po. One-nil.
''One nil b***h! Look at this b***h! He's having a look. He's thinking, 'I'm sure I can smell an illegal substance in there.' And he's hit the nail on the head.''
After taking the cigarette from Zayn he is also heard coughing and as spoke appears across the camera he says: ''Smokescreen Baby!''
The 'Live While We're Young' singer then passes the 'joint' back to his bandmate, saying: ''Zayn takes his job very seriously. He makes sure he goes through a two hour intense warm-up before every show. Just to get himself in the zone for the show.
''One very very important factor of Zayn's warm up of course if Mary J. herself. In fact I will present it to him now for some fantastic singing.''
Zayn, 21, is then seen smoking the roll-up and says: ''Nice''
A spokesman for the band has said: 'The matter is now in the hands of our lawyers'.
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