A 25-YEAR-OLD man left his ‘calling card’ on reception after breaking into a Blackburn business centre.

Blackburn magistrates heard blood on the front counter provided a DNA hit for Jonny Riley.

And when police went to his home to arrest Riley they discovered a ‘fledgling’ cannabis farm with a potential yield of over £12,000.

Riley, 25, of Burnley Road, Blackburn, pleaded guilty to burglary at Daisyfield Business Centre and theft of a phone, a computer and a TV monitor and producing 30 cannabis plants.

He was sent on bail to Preston Crown Court to be sentenced.

Catherine Allan, prosecuting, said Riley got into the business centre by breaking a window with a brick and had cut his hand in the process.

His visit was caught on CCTV but he was not identified until blood left on reception and a fingerprint were analysed.

When police went to arrest Riley they found the cannabis producing facility in his home.

Miss Allan said it was the fourth time Riley had been taken to court for producing cannabis.

Ian Huggan, defending, said the growing facility had only been set up recently and the question of yield was very difficult.

“He says a lot of these would not have survived and the remainder would have been for his own use,” said Mr Huggan.