My undergraduate research finally made its way through the peer review process this winter...so here it is!
TLDR; we don't find fractionally charged particles, but we do set strong limits using a pretty cool (and uncommon) detector technology for this type of search
journals.aps.org/prl/abstract...
journals.aps.org
The Cryogenic Underground Observatory for Rare Events (CUORE) is a detector array comprised by 988 $5\text{ }\text{ }\mathrm{cm}\ifmmode\times\else\texttimes\fi{}5\text{ }\text{ }\mathrm{cm}\ifmmode\t...