David Rivers

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In this Dec. 27, 2016 photo, David Rivers, Ph.D., Loyola University biology department chair, holds a fly sample he raised for his research in Baltimore, Md. Rivers and his students are researching on how to help law enforcement to identify real blood stains from fly contaminants at crime scene. (Kenneth K. Lam/The Baltimore Sun via AP)

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In this Dec. 27, 2016 photo, a filter disc contaminated with blood samples by flies similar to the ones, left, raised by David Rivers, Ph.D., Loyola University biology department chair, for his research in Baltimore, Md.. Rivers and his students are researching on how to help law enforcement to identify real blood stains from fly contaminants at crime scenes. (Kenneth K. Lam/The Baltimore Sun via AP)

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In this Dec. 27, 2016 photo, David Rivers, Ph.D., Loyola University biology department chair, looks over his flies he raises for research in Baltimore, Md. Rivers and his students are researching on how to help law enforcement to identify real blood stains from fly contaminants at crime scene. (Kenneth K. Lam/The Baltimore Sun via AP)

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In this Dec. 27, 2016 photo, David Rivers, Ph.D., Loyola University biology department chair, poses in Baltimore, Md. Rivers and his students are researching on how to help law enforcement to identify real blood stains from fly contaminants at crime scene. (Kenneth K. Lam/The Baltimore Sun via AP)

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Baylor's Isaiah Austin (21) shoots as Nebraska's David Rivers, left, defends during the first half of a second-round game in the NCAA college basketball tournament Friday, March 21, 2014, in San Antonio. (AP Photo/Eric Gay)

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Baylor's Cory Jefferson (34) shoots over Nebraska's David Rivers (2) during the first half of a second-round game in the NCAA college basketball tournament Friday, March 21, 2014, in San Antonio. (AP Photo/Eric Gay)

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Nebraska forward David Rivers, left, tries to steal a ball from Ohio State forward LaQuinton Ross in the first half of an NCAA college basketball game in the quarterfinals of the Big Ten Conference tournament Friday, March 14, 2014, in Indianapolis. (AP Photo/Michael Conroy)

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Nebraska forward Terran Petteway (5) drives to the basket against Purdue guard Kendall Stephens (21) as the Boilermakers' Terone Johnson (top right) and Nebraska forward David Rivers (2) look on during the second half of an NCAA college basketball game in Lincoln, Neb., Sunday, Feb. 23, 2014. (AP Photo/Francis Gardler)

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Purdue center A. J. Hammons (20) puts his arm into the nose of Nebraska forward David Rivers (2) as he lines up a shot during the first half of an NCAA college basketball game in Lincoln, Neb., on Sunday, Feb. 23, 2014. (AP Photo/Francis Gardler)

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Penn State's D.J. Newbill (2) goes for a layup against the defense of Nebraska players from left: Shavon Shields (31), David Rivers, Benny Parker (3) and Walter Pitchford (35), in the first half of an NCAA college basketball game in Lincoln, Neb., Thursday, Feb. 20, 2014. (AP Photo/Nati Harnik)