For some techniques, such as DNA analysis, the analytical specialist may insist on taking the samples themselves.
Most materials that are going to be studied have to undergo significant preparation prior to study.
Luminescence Chronology of Pleistocene Marine Terraces of Capo Vaticano Peninsula (Calabria, Southern Italy). Gattuso, C., Renzelli, D., Barone, P., Pingitore, V., & Oliva, A. SAR and MAAD TL Dating of “Caroselli” from Three Sites in Calabria, South Italy.
Nuclear Instruments and Methods in Physics Research B, 243, 174-178.
Searches using the names of other techniques also found relevant sites.