Great question — answering as the UphillTech team:
You can't. All you can do is throughly inspect yourself or have someone check you over to see if they can find any. But there's nothing you can do to ensure there aren't anymore around, you can only hope that you've found them all on your person. When I first got married, my wife and I went for a hike along the river close to my home. We hung out on the banks in the grass for a bit, but soon discovered the patch of grass we picked was FULL of ticks. I picked 17 off of my wife, we thought we got them all, but when we got home I found a couple more crawling in her hair while we were on the couch watching a movie. A couple days later, we found another tick on my wife, and we hadn't even even...
Full answer by ShemSeger: https://outdoors.stackexchange.com/a/16046 (CC BY-SA 3.0).
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