He presided over a number of criminal trials, including those of an Afghan warlord, Faryadi Sarwar Zardad, and two of the killers of Stephen Lawrence.
[10] The case concerned the £1.7 million robbery of the Menzies World Cargo warehouse at Heathrow airport in February 2004, of which all four of the accused were convicted.
[12] In December 2011, Treacy presided over the trial of Gary Dobson and David Norris for the racially aggravated murder of Stephen Lawrence.
[1][13] Lawrence had been murdered while waiting at a bus stop in Eltham, South London, in April 1993, by a gang of white youths chanting racist slogans.
The 1999 Macpherson Review of the case found shortcomings in the original police investigation and concluded the Metropolitan Police Force was rife with "institutional racism" and recommended a reduction in double jeopardy, the rule preventing someone being tried for the same crime twice, to allow for cases where "fresh and viable" new evidence became available to be retried.
In 2011, eighteen years after the incident, a cold case review found new DNA evidence using techniques not available at the time of the original investigation.