From National drug and alcohol treatment waiting times 1 January 2026 to 31 March 2026 Accredited official statistics, published today:

• 7,034 referrals to community-based services started treatment, broadly similar to the previous quarter (7,009).
• Nationally, the Standard was met for referrals to community-based services, with 92.4% (6,501) of referrals starting treatment within three weeks, compared with 92.6% in the previous quarter. Across all substance types, the Standard was met for drugs (94.2%), problematic use of both alcohol and drugs (91.5%) and alcohol (91.4%).

Source: https://www.publichealthscotland.scot/publications/national-drug-and-alcohol-treatment-waiting-times/national-drug-and-alcohol-treatment-waiting-times-1-january-2026-to-31-march-2026/

Since 2021, when the current system of recording was put in place, NHS Scotland has never failed to meet the standard, other than in prisons. https://publichealthscotland.scot/publications/show-all-releases?id=20553

Prior to that and going back to 2011 when the standard was first set, there are no reports of ever missing the 90% target.