KATIE TAYLOR will need more extensive drug testing for her next fight, whether that is a rematch with Delfine Persoon or a defence of her undisputed crown against Amanda Serrano.
Taylor unified the WBC, WBO, WBA and IBF lightweight world titles on a historic night at Madison Square Garden in New York when she beat Persoon on June 1.
Subscribe now to keep reading
We're chuffed you’re enjoying our website, but I'm afraid you need to be a subscriber to read this story.
As a subscriber you'll get access to all online content, including weekly issues - you can opt for digital only or print and digital - plus an online archive of weekly digital editions back to January 2012.
You'll also be helping to support our editorial independence so we can continue to get to the heart of the stories that truly matter to you, the reader. Every subscription we secure will go directly to ensuring that Boxing News retains its voice for many years to come.
If you're not ready to subscribe there are plenty of free articles on the site you can enjoy by registering
To enjoy premium content such as this story, and to get the weekly issue you will need to subscribe
Got an account? Sign in