With the Red Sox deep into the postseason and now facing the equally analytically minded Astros, those little edges come at a premium.
McLaughlin is not listed as an Astros employee, but is reportedly connected with team owner Jim Crane.
Stealing signs has been part of baseball since the invention of the game.
After being dispatched by the Astros in the first round of the playoffs, the Cleveland Indians apparently warned the Boston Red Sox that Houston might attempt to steal signs or information from their dugout.
A separate report identified the man as Kyle McLaughlin and says he aimed a cell phone into the Indians' dugout during their Game 3 loss to the Astros in the AL Division Series.
When presented with the details of the incident and the warning given to security heading into Game 1, a Red Sox spokesman said on Tuesday, "It is an Major League Baseball matter, so no one from the Red Sox would be commenting".
"We are aware of the matter, and it will be handled internally", Pat Courtney, MLB's chief communications officer, said Tuesday night, following Boston's 8-2 victory in Game 3 at Houston's Minute Maid Park. 'I'm anxious about the game'.
On Wednesday, MLB released a statement saying the league was alerted to possible sign stealing schemes and other improper use of video equipment prior to the postseason, and thus implemented additional security measures.
Melania Trump Flight Turns Back After Smoke Fills Plane Cabin
Pool reporters said a "thin haze of smoke" was visible and smelled something burning. Trump's trip is being evaluated, but she is expected to continue her travels today.
Neither the Red Sox or Astros provided further comments regarding the situation. Jose Altuve's ailing knee prompted manager A.J. Hinch to use Altuve as his DH in Game 3, shifting the versatile Marwin Gonzalez - who most frequently starts in left field - to second base and Kemp into the lineup.
According to Yahoo Sports, the Athletics also were suspicious of the Astros in August.
Whatever the Houston Astros were trying to do at Fenway Park during Game 1 of the ALCS on Saturday night, they got caught.
In 2017, an Major League Baseball investigation concluded that the Red Sox orchestrated a scheme to illicitly steal opponents' catchers hand signals during games with the help of an Apple Watch.
The Red Sox will have to look to Plan B.