Sniffer

A man settled into his window seat and soon a policeman joined him with a Black Labrador which jumped up into the middle seat

The first man looked quizzically and asked why is the dog was allowed on the plane.
The second man explained the dog was Police Drugs Enforcement Agency  'sniffing dog'. 'His name is Sniffer and he's the best there is. I'll show you when are airborne, when he goes to work.'

The plane soon took off, and once it levelled the Policeman commanded Sniffer to 'search'.

Sniffer jumped down and slowly moved down the aisle sniffing as he went. Soon he purposefully stopped next to a woman for several seconds and then returned and put one paw on the  policeman's arm.

The Policeman said, 'Good boy', 'and turned to man number one and said “That woman is in possession of marijuana, so I'm noting her seat and the authorities can apprehend her when we land.

'Gee, that's pretty good,' replied the first man.

Once again, the Policeman sent Sniffer to search. The Lab sniffed about and sat down beside a man for a few seconds, and then returned to its seat, this time placing two paws on the agent's arm.

The Policeman said, 'Two paws means the guys has cocaine, so again, I'm making a note of his seat number for the local police.'

'I like it!' said his seat mate.

The third time Policeman told Sniffer to 'search' .the dog followed the same routine but time came racing back to the agent and jumped into the middle seat and proceeded to shit all over the place.

The first man was really disgusted by this and couldn't figure out how or why a well-trained dog would behave like that A  bit miffed he said 'What's going  on?'

The Policeman nervously replied, 'He's just found a bomb.'