Visible crew/equipment: After the explosions at Rampart, when Dixie runs out of the hospital with the gurney and reaches Brackett, the outlines of the mic transmitter, its cable, and even the dark strap (that holds the lav transmitter) around her waist are visible on the back of Dixie's uniform.
Visible crew/equipment: When Johnny is taking Boot's temperature, the uncovered top of the set is visible at the corner behind Marco and Captain Stanley.
Visible crew/equipment: When Johnny is bending down while checking on Boot, who's hiding under the bed again, and also as he and Roy walk out of the dorm when Station 51 is dispatched to the 'stove fire', the outline of the lav mic transmitter is visible on the back of Johnny's shirt.
Visible crew/equipment: After Roy and Johnny are dispatched to the woman whose hand is caught in the blender, when they ring the doorbell and then walk to the back door, the outline of the mic transmitter is visible at the back of Johnny's shirt.
Visible crew/equipment: When Boot goes missing and 51's guys search for him, Roy finds Boot under the bed in the dorm, and the outlines of Johnny's mic transmitter and wire are visible on the back of his shirt.
Visible crew/equipment: When Boot follows Chet into Captain Stanley's office and the guys follow Boot, the outlines of Johnny's lav mic transmitter and wire are visible on the back of Johnny's shirt.
Visible crew/equipment: After Roy and Johnny help the woman whose hair was caught in the meat grinder, when they're putting their gear back in the squad, the outlines of the mic transmitters and wires are visible at the backs of Johnny's and Roy's shirts.
Answer: It is standard practice to wet down driveways so that they stand out in a long shot.
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