1. Nothing in this chapter shall require an employer to permit or accommodate the use, consumption, possession, transfer, display, transportation, distribution, sale, or growing of marijuana in the workplace.
2. Nothing in this chapter shall prohibit an employer from implementing policies restricting the use of marijuana by employees for the purpose of promoting workplace health and safety.
3. Nothing in this chapter shall prohibit an employer from including in a contract with an employee a provision prohibiting the use of marijuana.
4. Nothing in this chapter shall prohibit an employer from establishing and enforcing a zero-tolerance drug policy or a drug-free workplace by use of a drug testing policy in accordance with section 730.5 or any other procedures provided by federal statutes, federal regulations, or orders issued pursuant to federal law.