"It's kind of obvious in retrospect," Xu said, "but sticky spider webs may be a 'natural' DNA sampling device for DNA from the spider, and from what it's been eating."

徐说，“现在回想起来好像也很显而易见，粘粘的蜘蛛网是收集蜘蛛及其食物dna的“自然”采样设备。”

youdao

And it was developing a mobile DNA sampling kit to match body parts with animals.

BBC: Google cash buys drones to watch endangered species

For now, looks like the courts are on the side of DNA sampling being part of a reasonable search and seizure.

FORBES: Criminal DNA databases get a constitutional stamp of approval

While Justice Kennedy agreed that DNA sampling constituted a search of an arrestee's body, he said he considered it a minor intrusion.

WSJ: Supreme Court: Police Can Take DNA Samples in Arrests