I would like to know more about reliability. Could the administration of a scale used to measure relapse behaviour of a drug user affect its reliability, and how can this be minimized?

No problem at all and feel free to ask questions here again.

Thanks you very much.

Yes, the administration of a scale used to measure relapse behaviour of a drug user can affect its reliability, especially if the administration is inconsistent or influenced by extraneous factors. This can be minimized by standardizing the administration procedure and training the raters to ensure consistency.