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Drugs and medicines do not include hardware of any kind , equipment , appliances , devices or chemicals used to test body fluids and tissues . I think he was referring to an allegation that he made that the National Center for Science Education was instrumental in getting the article repudiated , I believe . The taxpayer may claim an exemption from tax on computer hardware , software and printers used by the programmers to code the software . We added subsections ( a ) ( 5 ) ( E ) and ( F ) to reflect changes in the tax law , effective October 1 , 1995 , defining as " non-commercial use " ( and therefore not taxable ) the off - wing processing , overhauling or repairing of a jet turbine engine or its parts for a certificated or licensed carrier of persons or property , and the repair , maintenance or restoration of rolling stock . The Secretary of State is offering the Texas Administrative Code through the Internet ( www.sos.state.tx.us ) free of charge for the next couple of months . When a company with a fleet of vehicles has inventory parts repaired , the total charge for the repair is taxable . If the contract or billing separates the charge for the scale from the charge for the installation , the customer may issue an exemption certificate for the scale , but not for the remodeling labor . ( Reading :) Dear Richard Nilsen : Contained in the most recent press release regarding the biology curriculum , the following was stated : The assistant superintendent in charge of curriculum development , Mr. Baksa , in coordination with the science department teachers , the district solicitor , and the school board , has developed the following procedural statement to use in implementing the new biology curriculum language . What he typically writes is responses to his critics , which is not the same thing as a peer-reviewed science article . We told the landscaping company that it should presume that its services are taxable and collect tax on the total charge unless the builder or contractor certifies in writing that the service is part of an improvement of real property with a new residential structure . At the time the standards came out in 2002 or somewhere in that neighborhood - - you can correct me if you can - - did the Dover Area School District participate in a field test of an examination in high school biology ? The recent session of the Legislature redefined " non-commercial use " ( i.e ., exempt from tax ) of gas and electricity by adding the off-wing processing , overhaul or repair of a jet turbine engine or its parts for a certificated or licensed carrier of persons or property , and the repair , maintenance or restoration of rolling stock to the list of non-commercial uses . And the proposal at that time was to take a standardized test in science in the tenth-grade year , and they were field testing the examination , and we were involved in that field test .