I found this when searching Diversion Safe Baby Bottle...
In both the Republic of Ireland and the United Kingdom, methadone patients may be dispensed a weekly dose of methadone, with prescribeddaily doses then administered at home each day. Harkin, Quinn & Bradley (1999) reported a survey conducted by 9 GPs in Dublin, Ireland regarding their client's use of a baby bottle to measure or store their methadone dose. A surprising 48 of 186 (26%) methadone patients stated that they had used a baby bottle to measure their methadone in the past month,with 21 of 186 (11%) reporting use of a baby bottle to store the methadone in the past month. A follow-up telephone survey of 10 pharmacists in Dublin and Manchester revealed that 8 of 10 offered a measuring device to new clients at a charge of 30-50p. A previously discarded graduated 30ml plastic device was also offered — although it was thought to be unsuitable for repeated use. The authors recommend that clients be asked how they measure their daily dose and that a free measuring device be included with each prescription.
http://72.14.203.104/search?q=cache:14sDqHt6YWUJ:www.rand.org/pubs/monograph_reports/MR1396/MR1396.ch5.pdf+baby+bottle+diversion+safe&hl=en&ct=clnk&cd=27&gl=us