I can foresee all manner of unintended consequences with this, as with other changes to legal conventions that have lasted for centuries (i.e. the double jeopardy scenario, right to silence, detention without trial, private/undisclosed evidence etc.).
All changed for 'good reasons' and with 'decent intentions' but, with each one, turning the ratchet one tooth further away from individual rights and granting ever more power to the State.
Once a principle has been broken, precedent is set and others will go the same way. For centuries the onus was always on the State proving their case against someone; increasingly the burden is shifting the other way and I don't like the direction of travel.