Small Particle Reagent (SPR) can be used on which type of surfaces?

Small Particle Reagent (SPR) is a specialized technique used in latent print examination that is particularly effective for visualizing fingerprints. It is designed to adhere to the components of sweat and oils present in the fingerprint residue, which allows for the detection of prints on a variety of surfaces.

SPR is versatile and can be applied to non-porous surfaces—such as glass, plastic, and metal—where it can provide clear visual results. Additionally, it can also be utilized on wet surfaces, as it is effective in displacing water to reveal the latent prints left behind. Moreover, the method has applications on porous surfaces, which can often retain prints in the materials' texture, though the efficiency and results may vary compared to non-porous applications.

The capability of SPR to be used on all these types of surfaces highlights its importance in forensic investigations, as it widens the range of evidence that can be examined for latent prints. This adaptability is a key reason for selecting "All of the Above" as the correct answer, showcasing the reagent’s utility across various challenging environments encountered in crime scene investigations.