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to save the lives of new yorkers and to save the lives of first responders. >> reporter: using the technology helped first responders to rescue five victims and to identify one fatality. new york city's police department is also turning on a slew of robotic tools from the department's own digi dogs, to robots that listen and give officers extra eyes on the ground. trace? >> molly, thank you. now to an interesting free speech case that's shaping up in michigan tonight with one school district's efforts to control political messages on students' clothing. let's bring in washington times legal affairs reporter alex weir. this is foundation for individual rights and expression wrote the following, quoting, when the school relaxes the dress code for field day, they order a student to stop wearing a trump flag as a cape, but permitted other students to wear gay pride flags in the same manner. this is kind of soft