Uplifted dolphins have resulted in great advances in sonar technology. One product of this is the Sonojector
The Sonojector is a device used by medical orderlies, prison guards and some police. It is used to subdue violent patients or suspects.
The Sonojector resembles a small flashlight in shape. When the muzzle end of the Sonojector is pressed against a body it emits a sonar pulse. The resonance of the pulse through the volume of tissue is used by the device to estimate the size of the target. This data is used to regulate the dose of tranquilizer that is then injected into the target by a needleless jet injector system.