Truth about Tracy Barlow's Corrie return

With thanks to Sky TV, here's how we know how Tracy Barlow gets out of jail for her return to Coronation Street. 

Remember that in 2007, Tracy was sent down for 15 years for the manslaughter of Charlie Stubbs.  Well, Tracy Barlow makes her return on Christmas Eve, but how does she get out of jail?  It turns out the forensic expert in her murder trail was a fraud.

I still wish they'd kept her locked up.