Dude, they're not talking about drug tests where your employer wants to check if you're high on crack cocaine.
They're talking about drug tests where a new experimental drug needs to be tested, first on mice and then humans, to see if it's safe enough for FDA approval.
Your trainer was an idiot, not a network admin. Oracle database and the various Oracle apps I've used have no silly issues with firewalls. They may have some apps with issues, but not the main product which uses a single consistent TCP port for connections.
Yes
Since the company you're buying things from has raised its rates by 3 to 5% in order to cover the charges the credit card company charges them on transactions.
At no point does the credit card company not make extra money from your transaction, you're just not smart enough to realize you're paying for that case back yourself in the cost of the items you're buying.
Product A costs $1.00 to make a proper profit, company raises the rate to $1.05. You use a credit card to buy it and think you're awesome for getting $0.02 back from the purchase.
A morsel of genuine history is a thing so rare as to be always valuable. -- Thomas Jefferson