Wrong again.
https://www.armscontrol.org/factsheets/cbwprolif
THE UNITED STATES
Biological Weapons
State declaration: The United States unilaterally gave up its biological weapons program in 1969. The destruction of all offensive BW agents occurred between 1971 and 1973. The United States currently conducts research as part of its biodefense program.
Allegations: According to
a compliance report published by the Russian government in August 2010, the United States is undertaking research on Smallpox which is prohibited by the World Health Organization. Russia also accused the United States of undertaking BW research in order to improve defenses against bio-terror attacks which is “especially questionable from the standpoint of Article I of the BTWC.”
Chemical Weapons
State declaration: The United States declared a large chemical arsenal of 27,770 metric tons to the OPCW after the CWC came into force in 1997. Along with Russia, the United States received an extension when it was unable to complete destruction of its chemical stockpiles by 2012.
A 2016 OPCW report declared that the United States had destroyed approximately 90 percent of the chemical weapons stockpile it had declared as the CWC entered into force; nearly 25,000 metric tons of the declared total of 27,770. The United States has destroyed all of Category 2 and Category 3 weapons and is projected to complete destruction of its Category 1 weapons by 2023.
Allegations: A 2010 Russian report alleged that the United States has legislation which could inhibit inspections and investigations of U.S. chemical facilities. Russia has also accused the United States of not fully reporting chemical agents removed from Iraq between 2003 and 2008 and sent to the United States for testing and subsequent destruction.