Most Texas PIs seem to consider the use of audio enhancement technology to be wiretapping. But they do not seem to consider video or photography enhancement technology to be the same.
A Texas PI will use an optical zoom on a camera or video recorder, and consider it to be legal. The same for applying photo filtering (glare reducers, specific color filters).
Most will not consider the use audio filters, like electronic processing to remove extra sounds, amplification of the sounds, boom microphones, parabolic microphones or receivers, etc. to be legal. They claim they run afoul of wiretap laws.
Assuming the subject is in a public place without reasonable expectations of privacy, wouldn't the use of either audio or video enhancement technology be the same?
Audio is waves of air and light/video/photo are electromagnetic waves, so the physical manifestation of the information is the same physically.
Why is the difference legally?