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A child watches a protest march for Freddie Gray as it passes by, Wednesday, April 22, 2015, in Baltimore. Gray died from spinal injuries about a week after he was arrested and transported in a police van. (AP Photo/Patrick Semansky)

“Policy is policy, practice is something else,” particularly if a prisoner is combative, Davey told The Associated Press. “It is not always possible or safe for officers to enter the rear of those transport vans that are very small, and this one was very small.”

FILE - This image made from video released anonymously to reporters in Pakistan on Thursday, Dec. 26, 2013, which is consistent with other AP reporting, shows Warren Weinstein, a 72-year-old American development worker who was kidnapped in Pakistan by al-Qaida in 2011. The White House says Weinstein and Giovanni Lo Porto, an Italian held by the terror organization since 2012, were inadvertently killed during U.S. counterterrorism operations in a border region of Afghanistan and Pakistan in January 2015. In addition, the U.S. believes that two Americans who were working with al-Qaida were also killed. (AP Photo via AP video, File)

“It is a cruel and bitter truth that in the fog of war generally and our fight against terrorists specifically, mistakes — sometimes deadly mistakes — can occur,” Obama said at the White House.

FILE - In this file photo taken on Feb. 13, 2011, a boatload of would-be migrants believed to be from North Africa is seen moments before being rescued by the Italian Coast Guard in the waters off the Sicilian island of Lampedusa, Italy. Large and barely seaworthy wooden fishing boats carrying loads of many more paying migrants are so highly valued by Libyan smugglers that armed men recently showed up in speedboats to recover them for reuse after migrants were saved by the European Union's Frontex border patrol mission. As the number of migrants heading to Europe soars, the boats that get them there are the smuggler's key commodity - one that's incredibly difficult for authorities to prevent them from obtaining. (AP Photo/Daniele La Monaca, File)

Anticipating every European move, however, the nimble smugglers are turning now to a newer, cheaper and more dangerous tactic — launching rubber dinghies crammed with migrants that sometimes start deflating even before they reach Italy.

FILE - In this Aug. 2, 2003 file photo, a bumblebee sits atop a gray-headed coneflower in Dauphin, Pa. A common pesticide is dramatically harming wild bees, according to a new in-the-field study that outside experts say may shift the way the U.S. government looks at a controversial class of chemicals.  (AP Photo/Carolyn Kaster, File)

“This paper has the potential of really shifting the conversation,” said University of Maryland entomologist Dennis vanEnglesdorp, who wasn’t part of the study. “Neonics may have a very dramatic effect on these non-managed pollinators in the environment. This is the most definitive work I’ve seen in the area.”