Here's why:

* Naturally occurring: Technetium exists in trace amounts in nature, formed by the spontaneous fission of uranium.

* Laboratory made: Technetium was first discovered in 1937 in a laboratory setting by bombarding molybdenum with deuterons. It's primarily produced synthetically today.

So, while technetium is found naturally, its primary source and how it's obtained make it categorized as a laboratory-made element.