What the maximum waiting time has been for NHS residential drug rehabilitation in each year since 2006-07.

Before 2007-08, information was not collected on the full length of time a person waited from their referral to starting drug treatment.
Prior to the introduction of a new Drug and Alcohol Treatment Waiting Times Database in April 2011 by the Scottish Government, information was collected on two separate stages of a person’s wait for drug treatment through the Drug Treatment Waiting Times Information Framework.
The first stage collected information on how long people waited from the date they received their referral to the date when they were offered a date for an assessment; and the second stage collected information from the date their care plan was agreed to the date that they were offered an appointment for treatment.
The new Drug and Alcohol Treatment Waiting Times Database (managed by the Information Services Division of NHS National Services Scotland) went live on 1 April 2011 and provides data on five types of specialist treatment interventions, including residential rehabilitation. It does not distinguish between residential drug rehabilitation provided by the NHS, voluntary sector or the private sector.
What we knew prior to April 2011 from the former Drug Treatment Waiting Times Information Framework is as follows:
Longest Wait Recorded for Someone Offered an Appointment for Residential Treatment from their Care Plan Being Agreed*
Year

2006-07
52+ weeks
2007-08
52+ weeks
2008-09
27-52 weeks
2009-10
27-52 weeks
2010-11
13-26 weeks
Note: It is unknown how long these people waited for an assessment date prior to being offered an appointment for treatment and whether they actually entered treatment
Source: Drug Treatment Waiting Times Information Framework, Information Services Division (ISD) of NHS National Services Scotland,
What we know now since the introduction of the new Drug and Alcohol Treatment Waiting Times Database is as follows:
Longest Wait Recorded between Referral Received and Treatment Starting
Year

2011-12
9-12 weeks
Source: Drug Treatment Waiting Times Information Framework, Information Services Division of NHS National Services Scotland.
The most recent statistics on drug treatment waiting times in Scotland showed that at the end of March 2012, three people were still waiting over three weeks to enter residential drug treatment and that nobody had been waiting over 12 weeks (Source: Drug and Alcohol Treatment Waiting Times, published by ISD Scotland in June 2012, Table 8).
Information on drug treatment waiting times is published quarterly by ISD Scotland and is available online:
http://www.drugmisuse.isdscotland.org/wtpilot/reports.htm