Mae Llywodraeth y DU wedi cael gwybod bod pryderon ynghylch pa mor ddibynadwy yw profion tocsicoleg i ganfod cyffuriau ac alcohol. Mae'n bosibl bod rhai achosion llys wedi dibynnu ar y canlyniadau hyn. Mae hefyd yn bosibl bod awdurdodau lleol wedi dibynnu ar y canlyniadau hyn wrth wneud penderfyniadau ynghylch amddiffyn plant, y tu allan i broses y llysoedd, neu gan gyflogwyr preifat.
The UK Government has been advised that there are concerns regarding the reliability of toxicology tests for drugs and alcohol. These results may have been relied on in court proceedings. It is also possible that such results were relied on by local authorities when making child protection decisions outside the court process or by private employers.