Louisiana, was delayed following Hurricane Katrina because of the devastation caused by the storm and the collapse of the levees. Many of the exteriors were set to be shot in New Orleans, including a key sequence involving the Canal Street Ferry across the Mississippi River. After the city was reopened, the cast and crew returned to New Orleans to continue filming. Some scenes of the post-Katrina devastation were worked into the plot, including those in the Lower 9th Ward; additionally, evidence of Katrina's impact on the city was worked into the script. The filming crew spent two weeks filming a scene at the Four Mile Bayou in Morgan City, Louisiana. According to director Tony Scott, Déjà Vu was written to take place on Long Island, but after a visit to New Orleans Scott felt that it would be a far better venue. Jerry Bruckheimer reportedly said that Denzel Washington was "adamant about returning to New Orleans to film after Hurricane Katrina devastated the region", but Washington recalled being neutral on the subject, while agreeing that it was "a good thing to spend money there and put people to work there". To create a sense of realism, Scott and Washington interviewed numerous men and women whose real-life occupations pertained to positions in the Federal Bureau of Investigation and the Bureau of Alcohol, Tobacco, Firearms and Explosives; Washington has noted that he and Scott conducted similar research during the productions of Man on Fire and Crimson Tide. Visual effects Visual effects editor Marc Varisco, who had previously collaborated with director Scott on the 2005 film Domino, worked again with Scott to develop Déjà Vu into a fully-fledged work. In total, approximately 400 visual effects scenes were shot during the production of Déjà Vu. They had acquired a LIDAR device, which incorporated lasers to scatter light with the intent of mapping out a small region, during the production of Domino; Scott and Varisco decided to use the apparatus again during the production of Déjà Vu. Additionally, the two utilized the Panavision Genesis high definition camera to film the shots that would encompass the past that the Snow White team would peer at throughout the film, as well as the various night scenes. The LIDAR apparatus, which was operated by a hired Texan company devoted to the device, performed scans of Claire Kuchever's apartment, the ferry, the ATF office, and actress Paula Patton, among