https://www.thenation.com/article/society/ssi-rules-families-poverty/
The Supplemental Security Income program (SSI) was created in 1972 under the Nixon administration to provide financial support to low-income seniors and disabled people. An effort to federalize state-level adult support programs across the country, SSI is a means-tested program—there are financial requirements to be eligible. In the case of SSI, as of its last adjustment in 1989, enrollees cannot have savings of more than $2,000 as an individual or $3,000 as a family. Furthermore, SSI beneficiaries are prohibited from having retirement accounts, life insurance policies, certain types of personal property, funeral/burial policies, and access to other types of income.
[emphasis mine]
OMG I'm gonna test some means! 
If they find out you have cash saved anywhere, they will make you pay it back. That is if you don't get convicted of a felony for lying to the SSA/IRS. They even have a hotline people can call to report this "fraud," so snitches can snitch (and they don't even get rewarded).
"Fraud"
I hate this fucking country so much. Saving fucking pennies so you can meet the most basic needs while evading the fucking disabilty gestapo, they have the absolute fucking gall to call it "fraud".
Hate. Hate. Let me tell you how much i have come to hate america since i began to live.