"a reason can be found" is correct and usable in written English.
You can use this expression to indicate that there is an explanation for something. For example, "John was late to work again--a reason can be found, though."
A related reason can be found in the physics envy that infects many psychologists -- the desire to make psychology a "hard science", like physics, instead of the blend of biological and social science that it actually is.
They don't have a reason for this fixation no reason can be found.
When a truth is necessary, its reason can be found by analysis, resolving it into simpler ideas and truths, until we come to those that are primitive.
The reason can be found in a recent explosion in state legislation regulating the use of student data and safeguarding its privacy and security.
But the timing suggests that the real reason can be found in a political quid pro quo: Three days before Kuczynski issued the pardon, a faction of Fujimori loyalists led by Alberto's son, Kenji, saved the president from impeachment.
The reason can be found at a cavernous bus garage in the Bronx, where over the last several months transit mechanics and engineers have been completely rebuilding the guts of the city's oldest and most polluting diesel buses, installing cleaner, custom-made engines and placing powerful filters on the exhaust pipes.
The reason can be found on the fourth floor of a nondescript factory in a city once famous for cheap manufacturing and prostitution.
Perhaps the reason can be found in the stunning results of a study conducted by Northeastern University's Center for Labor Studies that broke down the unemployment rate by income.
Over much of the past decade and a half one reason can be found in Japan's unduly inward focus as a result of the stagnation of its domestic economy.
The reason can be found at the end of this article.
One reason can be found in the financier George Soros's concept of "reflexivity".
