This would cover, for example, cases where a badge has suffered accidental damage or where a badge may have been tampered with in some way.
Byddai hyn yn cynnwys, er enghraifft, achosion lle achoswyd difrod damweiniol i'r bathodyn, neu lle gallai rhywun fod wedi ymyrryd â'r bathodyn mewn rhyw ffordd.