What is an important step when preparing to lift a fingerprint?

Preparing the brush is vital when getting ready to lift a fingerprint because the brush is the primary tool used to apply fingerprint powder effectively. A well-prepared brush ensures that the powder adheres properly to the fingerprint residue without contaminating the print or damaging it. The bristles need to be clean and appropriately fluffed to avoid damaging fragile prints while also allowing for an even distribution of powder.

If the brush is not properly prepared, it can lead to poor quality lifts, making it difficult to analyze or compare fingerprints later. Ensuring the brush is in optimal condition contributes to the integrity and quality of the evidence collected, which is critical in forensic investigations.