Can you test other things than just saliva samples ?

Yes. But - it makes only sense for remains of dead people as every living tested person must give its written consent to the DNA analysis.
However, not every trace-sample is suitable for such a test. For example, hair from a hairbrush, or cut hair is not suitable for a paternity test. Because of the extra work required to perform this test (it is done by hand), it costs an additional 200 Euros. Please consult us before you order the test to make sure your trace-sample is suitable for such a test.