As the Free Beacon  reported:
The Houston Zoo has been forced to remove ‘no gun’ signs that gun carry activists say are illegal under Texas law.
The move comes after Texas passed a law  allowing average citizens to file complaints over illegal ‘no guns’ signs which would impose a $1,000 per day fine on localities in violation of the law. The law went into effect on September 1st, 2015 and the City of Houston requested that the Houston Zoo remove their no guns signs on September 10th, 2015. The Zoo said it was reviewing the legal implications of the city’s request but would comply with it in the meantime.