Please note that irrespective of recent changes in local cannabis legislation the following NHA Rules still apply:

Prohibited substances in horses Rule 73.4.2  
Natural or herbal substances or remedies and/or drugs which have any of the following properties:  
73.4.2.1   antipyretic, analgesic and anti-inflammatory properties;

Banned substances in riders Rule 77.2.2  
Cannabinoids – a concentration in urine of 11-nor-delta 9 tetrahydrocannabinol-9-carboxylic acid (carboxy-THC) greater than 50 nanograms per millilitre;

It is cautioned that preparations produced from any Cannabis plant species contain tetrahydrocannabinoids (THC) which could result in a positive finding in horses and riders.