Unfortunately, no. We spent a lot of time on our testing process, and over time we found that the best way to make Nima reliable and easy to use was to make the capsules one-time-use only (even if the test comes back as clear of the contaminant).
The disposable test capsules for Nima are essentially tiny chemistry labs that fit in the palm of your hand. Each contains a little bit of our proprietary testing solution which helps to "re-charge" the chemical component of the Nima sensor for each test and is used-up once a test has been completed.
Nima is also super-sensitive to the proteins it's detecting, and it's essentially impossible to get a capsule clean after is has been contaminated. This means they are not washable. Capsules should be thrown away after use.
There are a lot of reasons why it made the most sense to us to use disposable capsules with Nima, and if you'd like to read more about how we arrived at this decision you can read a blog post from our science team about it here.