Sheriff Jeffrey Gahler told Congress that Maryland's sanctuary law blocks his deputies from cooperating with ICE on detainer requests.
https://www.foxnews.com/politics/sheriff-suing-maryland-says-sanctuary-laws-ignore-lessons-911-stupidity-its-best
https://www.foxnews.com/politics/sheriff-suing-maryland-says-sanctuary-laws-ignore-lessons-911-stupidity-its-best