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We know that the Chicago Bears will be looking to make some additions to their defensive secondary-- either by draft or by free agency-- as cornerback Charles Tillman is set to become an unrestricted free agent, and there seems to be room for improvement at the safety positions currently manned by Major Wright and Chris Conte.
The only position locked down in the back-4 is cornerback Tim Jennings, who signed a 4-year, $22+ million contract extension last month.
General manager Phil Emery has stated multiple times that he wants to get younger on defense, so it is only natural to assume that he will look to draft at least one new starter in the secondary come April.
Here is a look at the defensive backs 40-yard dash times from this week, as well as their arm measurements. Make sure to click around THIS LINK to see a full spectrum of workouts for the DB's.
| Name | School | Height | Weight | Official 40 | Arm Length |
| Mo Alexander | Utah State | 6'1 | 220 | 4.54 | 32 5/8 |
| Ricardo Allen | Purdue | 5'9 | 187 | 4.61 | 30 |
| Dion Bailey | USC | 6'0 | 201 | 4.66 | 32 |
| Deion Belue | Alabama | 5'11 | 182 | DNP | 31 1/2 |
| Bene Benwikere | San Jose State | 5'11 | 195 | 4.63 | 30 |
| Nat Berhe | San Diego State | 5'10 | 193 | 4.71 | 30 5/8 |
| Tre Boston | North Carolina | 6'0 | 204 | 4.59 | 31 3/8 |
| Bashaud Breeland | Clemson | 5'11 | 197 | 4.62 | 31 3/4 |
| Terrence Brooks | Florida State | 5'11 | 198 | 4.42 | 31 |
| Deone Bucannon | Washington State | 6'1 | 211 | 4.49 | 32 3/8 |
| Travis Carrie | Ohio | 6'0 | 206 | DNP | 31 7/8 |
| Ha Ha Clinton-Dix | Alabama | 6'1 | 208 | 4.58 | 32 3/8 |
| Ross Cockrell | Duke | 6'0 | 191 | 4.56 | 29 7/8 |
| Aaron Colvin | Oklahoma | 5'11 | 177 | DNP | 31 |
| Chris Davis | Auburn | 5'10 | 202 | DNP | 31 |
| Darqueze Dennard | Michigan State | 5'11 | 191 | 4.51 | 30 1/4 |
| Pierre Desir | Lindenwood | 6'1 | 198 | 4.59 | 33 |
| Ahmad Dixon | Baylor | 6'0 | 212 | 4.64 | 32 1/4 |
| Brandon Dixon | NW Missouri St. | 5'11 | 203 | 4.41 | 32 1/2 |
| Jonathan Dowling | Western Kentucky | 6'3 | 190 | 4.52 | 33 1/8 |
| Antone Exume | Virginia Tech | 6'0 | 213 | 4.59 | 31 5/8 |
| Kyle Fuller | Virginia Tech | 6'0 | 190 | 4.49 | 32 7/8 |
| E.J. Gaines | Missouri | 5'10 | 190 | DNP | 30 3/8 |
| Phillip Gaines | Rice | 6'0 | 193 | 4.38 | 31 7/8 |
| Justin Gilbert | Oklahoma State | 6'0 | 202 | 4.37 | 33 1/8 |
| Demetri Goodson | Baylor | 5'11 | 194 | 4.52 | 31 3/4 |
| Andre Hal | Vanderbilt | 5'10 | 188 | 4.59 | 30 1/2 |
| Victor Hampton | South Carolina | 5'9 | 197 | 4.69 | 31 1/4 |
| Marqueston Huff | Wyoming | 5'11 | 196 | 4.49 | 31 3/8 |
| Bennett Jackson | Notre Dame | 6'0 | 195 | 4.51 | 31 3/8 |
| Kendall James | Maine | 5'10 | 180 | 4.44 | 29 1/2 |
| Stanley Jean-Baptiste | Nebraska | 6'3 | 218 | 4.61 | 32 3/8 |
| Dontae Johnson | N.C. State | 6'2 | 200 | 4.45 | 31 1/2 |
| Lamarcus Joyner | Florida State | 5'8 | 184 | 4.55 | 31 1/2 |
| Kenny Ladler | Vanderbilt | 6'0 | 207 | 4.7 | 31 5/8 |
| Nevo Lawson | Utah State | 5'9 | 190 | 4.48 | 31 1/2 |
| Isaiah Lewis | Michigan State | 5'10 | 211 | 4.6 | 31 1/2 |
| Craig Loston | LSU | 5'11 | 217 | 4.65 | 30 3/4 |
| Dex McDougle | Maryland | 5'10 | 196 | DNP | 30 5/8 |
| Keith McGill | Utah State | 6'3 | 211 | 4.51 | 33 1/4 |
| Terrance Mitchell | Oregon | 5'11 | 192 | 4.63 | 30 1/8 |
| Jabari Price | North Carolina | 5'10 | 200 | 4.45 | 31 5/8 |
| Calvin Pryor | Louisville | 5'11 | 207 | 4.58 | 31 3/8 |
| Loucheiz Purifoy | Florida | 5'11 | 190 | 4.61 | 32 3/4 |
| Keitth Reaser | Florida Atlantic | 5'10 | 189 | DNP | 30 3/4 |
| Ed Reynolds | Stanford | 6'1 | 207 | 4.57 | 30 3/4 |
| Rashaad Reynolds | Oregon State | 5'10 | 189 | 4.51 | 31 5/8 |
| Marcus Roberson | Florida | 6'0 | 191 | 4.61 | 31 |
| Bradley Roby | Ohio State | 5'11 | 194 | 4.39 | 31 1/2 |
| Daniel Sorensen | BYU | 6'1 | 205 | 4.67 | 31 |
| Dez Southward | Wisconsin | 6'0 | 211 | DNP | 30 5/8 |
| Vinnie Sunseri | Alabama | 5'11 | 210 | DNP | 30 |
| Jemea Thomas | Georgia Tech | 5'9 | 192 | 4.55 | 30 5/8 |
| Brock Vereen | Minnesota | 6'0 | 199 | 4.47 | 30 |
| Jason Verrett | Texas Christian | 5'9 | 189 | 4.38 | 30 5/8 |
| Jimmie Ward | Northern Illinois | 5'11 | 193 | DNP | 31 |
| Todd Washington | SE Louisiana | 5'11 | 196 | DNP | 31 1/8 |
| Jaylen Watkins | Florida | 5'11 | 194 | 4.41 | 30 5/8 |
| Lavelle Westbrooks | Georgia Southern | 5'11 | 186 | 4.63 | 32 3/8 |
Have you been tracking the defensive backs at the Combine? If so, what are your thoughts on potentially drafting one or more of these prospects?